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Calculus 2 : Polar Form

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Example Questions

Example Question #21 : Polar Form

What is the polar form of y=2x-1 ?

Possible Answers:

$r=-\frac{1}{\sin\theta-2\cos\theta}$

$r=\frac{1}{\sin\theta-2\cos\theta}$

$r=-\frac{1}{\sin\theta+2\cos\theta}$

$r=\frac{1}{\sin\theta+2\cos\theta}$

None of the above

Correct answer:

$r=-\frac{1}{\sin\theta-2\cos\theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given y=2x-1 , then:

$r\sin\theta=2(r\cos\theta)-1$

$r\sin\theta-2(r\cos\theta)=-1$

$r(\sin\theta-2\cos\theta)=-1$

$r=-\frac{1}{\sin\theta-2\cos\theta}$

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Example Question #22 : Polar

What is the polar form of y=3-4x ?

Possible Answers:

$r=\frac{3}{\sin\theta+4\cos\theta}$

$r=-\frac{3}{\sin\theta-4\cos\theta}$

$r=-\frac{3}{\sin\theta+4\cos\theta}$

None of the above

$r=\frac{3}{\sin\theta-4\cos\theta}$

Correct answer:

$r=\frac{3}{\sin\theta+4\cos\theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given y=3-4x , then:

$r\sin\theta=3-4(r\cos\theta)$

$r\sin\theta+4(r\cos\theta)=3$

$r(\sin\theta+4\cos\theta)=3$

$r=\frac{3}{\sin\theta+4\cos\theta}$

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Example Question #23 : Polar

What is the polar form of y=-10x+5 ?

Possible Answers:

$r=\frac{5}{\sin\theta+10\cos\theta}$

None of the above

$r=-\frac{5}{\sin\theta-10\cos\theta}$

$r=\frac{5}{\sin\theta-10\cos\theta}$

$r=-\frac{5}{\sin\theta+10\cos\theta}$

Correct answer:

$r=\frac{5}{\sin\theta+10\cos\theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given y=-10x+5 , then:

$r\sin\theta=-10(r\cos\theta)+5$

$r\sin\theta+10(r\cos\theta)=5$

$r(\sin\theta+10\cos\theta)=5$

$r=\frac{5}{\sin\theta+10\cos\theta}$

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Example Question #21 : Functions, Graphs, And Limits

What is the polar form of $y=\frac{2}{3}x+9$ ?

Possible Answers:

$r=\frac{9}{\sin\theta+\frac{2}{3}\cos\theta}$

$r=\frac{9}{\sin\theta-\frac{2}{3}\cos\theta}$

None of the above

$r=-\frac{9}{\sin\theta+\frac{2}{3}\cos\theta}$

$r=-\frac{9}{\sin\theta-\frac{2}{3}\cos\theta}$

Correct answer:

$r=\frac{9}{\sin\theta-\frac{2}{3}\cos\theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given $y=\frac{2}{3}x+9$ , then:

$r\sin\theta= \frac{2}{3}(r\cos\theta)+9$

$r\sin\theta-\frac{2}{3}(r\cos\theta)=9$

$r(\sin\theta-\frac{2}{3}\cos\theta)=9$

$r=\frac{9}{\sin\theta-\frac{2}{3}\cos\theta}$

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Example Question #22 : Polar Form

What is the polar form of $y=\frac{1}{2}x+6$ ?

Possible Answers:

$r=-\frac{6}{\sin\theta-\frac{1}{2}\cos\theta}$

$r=\frac{6}{\sin\theta-\frac{1}{2}\cos\theta}$

$r=\frac{6}{\sin\theta+\frac{1}{2}\cos\theta}$

$r=-\frac{6}{\sin\theta+\frac{1}{2}\cos\theta}$

None of the above

Correct answer:

$r=\frac{6}{\sin\theta-\frac{1}{2}\cos\theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given $y=\frac{1}{2}x+6$ , then:

$r\sin\theta=\frac{1}{2}(r\cos\theta)+6$

$r\sin\theta-\frac{1}{2}(r\cos\theta)=6$

$r(\sin\theta-\frac{1}{2}\cos\theta)=6$

$r=\frac{6}{\sin\theta-\frac{1}{2}\cos\theta}$

Report an Error

Example Question #21 : Polar Form

What is the polar form of $y=-9x^{2}$ ?

Possible Answers:

$r=tan9\theta\sec\theta$

$r=-9tan\theta\sec\theta$

$r=9tan\theta\sec\theta$

$r=\frac{1}{9}tan\theta\sec\theta$

$r=-\frac{1}{9}tan\theta\sec\theta$

Correct answer:

$r=-\frac{1}{9}tan\theta\sec\theta$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given $y=-9x^{2}$ , then:

$r\sin\theta=-9(r\cos\theta)^{2}$

Dividing both sides by $r\cos\theta$ , we get:

$\tan\theta=-9r\cos\theta$

$r=-\frac{\tan\theta}{9\cos\theta}$

$r=-\frac{1}{9}tan\theta\sec\theta$

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Example Question #22 : Polar Form

What is the polar form of y=14-8x ?

Possible Answers:

$r=-\frac{14}{\sin\theta-8\cos\theta}$

$r=\frac{14}{\sin\theta-8\cos\theta}$

None of the above

$r=-\frac{14}{\sin\theta+8\cos\theta}$

$r=\frac{14}{\sin\theta+8\cos\theta}$

Correct answer:

$r=\frac{14}{\sin\theta+8\cos\theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given y=14-8x , then:

$r\sin\theta=14-8(r\cos\theta)$

$r\sin\theta+8(r\cos\theta)=14$

$r(\sin\theta+8\cos\theta)=14$

$r=\frac{14}{\sin\theta+8\cos\theta}$

Report an Error

Example Question #25 : Polar Form

What is the polar form of $y=\frac{5}{4}x+2$ ?

Possible Answers:

None of the above

$r=\frac{2}{\sin\theta+\frac{5}{4}\cos \theta}$

$r=-\frac{2}{\sin\theta-\frac{5}{4}\cos \theta}$

$r=-\frac{2}{\sin\theta+\frac{5}{4}\cos \theta}$

$r=\frac{2}{\sin\theta-\frac{5}{4}\cos \theta}$

Correct answer:

$r=\frac{2}{\sin\theta-\frac{5}{4}\cos \theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given $y=\frac{5}{4}x+2$ , then:

$r\sin\theta=\frac{5}{4}(r\cos \theta)+2$

$r\sin\theta-\frac{5}{4}(r\cos \theta)=2$

$r(\sin\theta-\frac{5}{4}\cos \theta)=2$

$r=\frac{2}{\sin\theta-\frac{5}{4}\cos \theta}$

Report an Error

Example Question #23 : Polar Form

What is the polar form of $y=-15x^{2}$ ?

Possible Answers:

$r=-\frac{1}{15}\tan\theta\sec\theta$

$r=\frac{1}{15}\tan\theta\sec\theta$

$r=\tan15\theta\sec\theta$

$r=15\tan\theta\sec\theta$

$r=-15\tan\theta\sec\theta$

Correct answer:

$r=-\frac{1}{15}\tan\theta\sec\theta$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given $y=-15x^{2}$ , then:

$r\sin\theta=-15(r\cos \theta)^{2}$

Dividing both sides by $r\cos\theta$ , we get:

$\tan\theta=-15(r\cos \theta)$

$r=-\frac{\tan\theta}{15\cos \theta}$

$r=-\frac{1}{15}\tan\theta\sec\theta$

Report an Error

Example Question #711 : Calculus Ii

What is the polar form of y=3x-8 ?

Possible Answers:

None of the above

$r=-\frac{8}{\sin\theta+3\cos\theta}$

$r=-\frac{8}{\sin\theta-3\cos\theta}$

$r=\frac{8}{\sin\theta+3\cos\theta}$

$r=\frac{8}{\sin\theta-3\cos\theta}$

Correct answer:

$r=-\frac{8}{\sin\theta-3\cos\theta}$

Explanation:

We can convert from rectangular to polar form by using the following trigonometric identities: $y=r\sin\theta$ and $x=r\cos\theta$ . Given y=3x-8 , then:

$r\sin\theta=3(r\cos \theta)-8$

$r\sin\theta-3(r\cos \theta)=-8$

$r(\sin\theta-3\cos \theta)=-8$

$r=-\frac{8}{\sin\theta-3\cos\theta}$

Report an Error

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Calculus 2 : Polar Form

Study concepts, example questions & explanations for Calculus 2

All Calculus 2 Resources

Example Questions

Example Question #21 : Polar Form

Example Question #22 : Polar

Example Question #23 : Polar

Example Question #21 : Functions, Graphs, And Limits

Example Question #22 : Polar Form

Example Question #21 : Polar Form

Example Question #22 : Polar Form

Example Question #25 : Polar Form

Example Question #23 : Polar Form

Example Question #711 : Calculus Ii

All Calculus 2 Resources

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