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October 20, 2014

October 20, 2014

Posted by **Kelsey** on Wednesday, May 30, 2012 at 12:42am.

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!

- Precalculus check answers help! -
**Pendergast**, Wednesday, May 30, 2012 at 12:46am1), 3) check your algebra

4) I'm not sure where you went wrong on this one. However, sqrt(6)-sqrt(2)/4 is greater than 1 (2.0959 in fact)

2), 5) are correct

- Precalculus check answers help! -
**Kelsey**, Wednesday, May 30, 2012 at 12:59amis 3 -1?

and im not sure what i did on number 1 ? please explain.

- Precalculus check answers help! -
**Reiny**, Wednesday, May 30, 2012 at 7:25am1)

secØ sinØ cotØ cscØ

= (1/cosØ)(sinØ)(cosØ/sinØ)(1/sinØ)

= 1/sinØ

= cscØ

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