# Precalculus check answers help!

posted by
**Kelsey**
.

1.) Find an expression equivalent to sec theta sin theta cot theta csc theta.

tan theta

csc theta

sec theta ~

sin theta

2.) Find an expression equivalent to cos theta/sin theta .

tan theta

cot theta ~

sec theta

csc theta

3.) Simplify (tan^2 theta + 1)/(tan^2 theta) .

csc2 theta

–1

tan2 theta

1 ~

4.) Use a sum or difference identity to find the exact value of sin 15°.

-(sqrt)2 - (sqrt)6/ 4

(sqrt)6 - (sqrt)2/ 4 ~

(sqrt)6 + (sqrt)2/ 4

(sqrt)2 - (sqrt)6/ 4

5.) Which expression is equivalent to cos (theta – 2pi)?

–cos theta

sin theta

cos theta ~

–sin theta

the ones with ~ are my answers!