ACT Math : How to find the period of the sine

Example Questions

Example Question #1 : Sine

What is the period of 2sin(4Θ)?

None of the answers are correct

Explanation:

The period of sinΘ is 2Π, so we set the new angle equal to the base period of 2Π and solve for Θ.

So 4Θ = 2Π and Θ = Π/2.

Example Question #2 : Sine

A function with period P will repeat on intervals of length P, and these intervals are referred to as periods.

Find the period of

.

Explanation:

For the function

the period is equal to

in this case

which reduces to .

Example Question #1 : Sine

A function with period P will repeat on intervals of length P, and these intervals are referred to as periods.

Find the period of the function

.

Explanation:

For the function

the period is equal to

in this case

which reduces to .

Example Question #1 : Sine

What is the period of the function ?

Explanation:

To find the period of Sine and Cosine functions you use the formula:
where  comes from . Looking at our formula you see b is 4 so

Example Question #5 : Sine

What is the period of the given trigonometric function:

Explanation:

To find the period of a sine, cosine, cosecant, or secant funciton use the formula:

where  comes from the general formula: . We see that for our equation  and so the period is  when you reduce the fraction.

Example Question #6 : Sine

Find the period of the following formula: