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ACT Math : How to find the domain of the cosine

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Example Questions

Example Question #1 : How To Find The Domain Of The Cosine

What is the domain of $y=cos(\theta) -3$ ?

Possible Answers:

[-3,3]

$(-\infty,-3]$

Does not exist.

${}(-\infty,\infty)$

${}(-\infty,-3)$

Correct answer:

${}(-\infty,\infty)$

Explanation:

The domain of a function is referring to the x values that can be plugged into the function and produce a value.

The domain of the parent function $cos(\theta)$ has a domain from negative infinity to positive infinity.

The term only shifts the function down three units, which will not affect the domain of the cosine graph.

Therefore, the answer is ${}(-\infty,\infty)$ .

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Example Question #2 : How To Find The Domain Of The Cosine

Given a function $y=2cos(\theta)+6$ , what is a valid domain?

Possible Answers:

$(0,\infty)$

(2,6)

$[0,\infty)$

[2,6]

$(-\infty, \infty)$

Correct answer:

$(-\infty, \infty)$

Explanation:

The function $y=2cos(\theta)+6$ is related to the parent function $y=cos(\theta)$ .

The domain of the parent function is $(-\infty,\infty)$ . The values and will not affect the domain of the curve.

The answer is $(-\infty,\infty)$ .

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Example Question #3031 : Act Math

What is the domain of the following trigonometric equation:

$f(t) = -2\cos(12t)$

Possible Answers:

$(-\infty,\infty)$

$[-2\pi,2\pi]$

[2,12]

[-12,12]

[-2,2]

Correct answer:

$(-\infty,\infty)$

Explanation:

For sine and cosine, they can take any for , thus the domain is all real numbers or:

$(-\infty,\infty)$

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Example Question #22 : Cosine

What is the domain of the function f (x) = cos(x) ?

Possible Answers:

$(-\infty, 1]$

$[-1, \infty)$

$(-\infty, \infty )$

[-1, 1]

$[-\pi, \pi]$

Correct answer:

$(-\infty, \infty )$

Explanation:

The domain of a function refers to all possible values of for which an answer can be obtained. Cosine, as a function, cycles endlessly between and (subject to modifiers of the amplitude). Because there is no real number value that can be inserted into in this case which does not produce a value between and , the domain of cosine is effectively infinite.

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Example Question #23 : Cosine

What is the domain of the function f (x) = cos (x) +7 ?

Possible Answers:

$(-\infty, \infty)$

$(-\infty +7, \infty +7)$

[-7, 7]

$[-7, \infty)$

$(-\infty, 7]$

Correct answer:

$(-\infty, \infty)$

Explanation:

Note that adding to the end of the equation changes nothing with respect to domain, as there is no such thing as "infinity plus seven", nor "negative infinity plus seven". The function is still infinite in domain even when shifted up units.

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Example Question #24 : Cosine

What is the domain of the function f (x) = 8 cos (3x) ?

Possible Answers:

$[-24\pi, 24\pi]$

$(-24\infty, 24\infty)$

[-24, 24]

$(-\infty, infty)$

Correct answer:

$(-\infty, infty)$

Explanation:

Note that in this case, neither the nor the on the outside affect the domain of the function. They do affect the amplitude, which means the value for range will change, but there is no such thing as "three times infinity" nor "three times negative infinity", so the effective domain remains infinite.

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ACT Math : How to find the domain of the cosine

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #1 : How To Find The Domain Of The Cosine

Example Question #2 : How To Find The Domain Of The Cosine

Example Question #3031 : Act Math

Example Question #22 : Cosine

Example Question #23 : Cosine

Example Question #24 : Cosine

All ACT Math Resources

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