Question

Given: Cosine (x minus y)

Answer 1

The required steps that complete the proof are:

Step 1: Cofunction Identity

Step 5: Sine Difference Identity

Step 6: Cofunction Identity

Step 7: Cosine Function Is Even, Sine Function Is Odd

Trigonometry identity

Given the cosine function expressed as:

• cos(x - y)

The first step is to apply the cofunction identity as shown:

• Step 1: Cofunction Identity

cos(90 - x) = sin x

cos(x - y) = sin (90-(x-y))

• Step 5: Sine Difference Identity

For the fifth step, you will apply the sine difference identity.

• Step 6: Cofunction Identity

To get the sixth step, you will apply the Cofunction Identity on the result in the fifth step.

The final step 7 will be

• Step 7: Cosine Function Is Even, Sine Function Is Odd

Learn more on trigonometry identity here: brainly.com/question/24496175