Trigonometry : Sin, Cos, Tan

Study concepts, example questions & explanations for Trigonometry

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Example Questions

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Example Question #11 : Sine, Cosine, & Tangent

What is the value of cos30o . sin30o . tan60o

Possible Answers:

Correct answer:

Explanation:

Solution

Example Question #11 : Sin, Cos, Tan

 What is the closest value to this expression?

Possible Answers:

Correct answer:

Explanation:

First you have to know the equation for   and apply it to our equation. Second the formula of  will allow you to get rid of the square sin and cos. Third the equation  will allow you to get rid of the . Therefore, we will have a , and that will be equal to . Sum  and  and you will get 

Example Question #11 : Sin, Cos, Tan

if   What is ?

Possible Answers:

Correct answer:

Explanation:

Remember two things. First if , find the by using the Pythagoras Theorem. If one side is  and the hypotenuse is , then the other side is  will be . Finally remember the formula for . And just place the things we found to the equation.

Example Question #11 : Sin, Cos, Tan

If cos x = 0.2 and sin x = 0.4, what is the value of tan x?

Possible Answers:

2

10

0.035

4

1

Correct answer:

2

Explanation:

Example Question #551 : Trigonometry

Which of the following describes the ratio of sine? 

Possible Answers:

Correct answer:

Explanation:

Sine is by definition of sides in a right triangle is opposite side over hypotenuse.

To remember this, use SOH CAH TOA.

SOH: Sine=Opposite/Hypotenuse

CAH: Cosine=Adjacent/Hypotenuse

TOA: Tangent=Opposite/Adjacent

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