Sum and Difference Identities For Cosine

Practice Questions

Pre-Calculus › Sum and Difference Identities For Cosine

Questions

5

1

Use the sum or difference identity to find the exact value: $cos255^\circ$

2

Is the following equation an identity? $cos(x-\pi)=cos(x)$

3

Use the sum or difference identity to find the exact value: $\cos 255^{\circ}$

4

Use the sum or difference identity to find the exact value of $\sin 165^{\circ}$ .

5

Is the following equation an identity?

$\cos \left ( x-\pi \right )=\cos \left ( x \right )$

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