Posted by **Jamie** on Tuesday, September 28, 2010 at 8:12pm.

1.) cot(-θ)(secθ)

I think the answer is secθ but I don't know how to get this.

2.) (tanθ) / (cos)(90° -θ)

3.) 3sin2xcos2x - sin4x

4.) (cosx + tanx) / (csc^2 x)

- Math- Simplifying Identities -
**Reiny**, Tuesday, September 28, 2010 at 8:37pm
cot(-θ)(secθ)

= cos(-Ø)/sin(-Ø)(1/cosØ

= (cosØ/-sinØ)(1/cosØ

= - 1/sinØ

= - csc(Ø)

(test your answers with some weird angle, don't use 30's , 60's, or 45's)

2. you will have to know that

cos(90°-x) = sinx

take it from there

3. 3sin2xcos2x - sin4x

= 3sin2xcos2x - 2sin2xcos2x

= sin2xcos2x

or (1/2)sin4x

4. change everything to sines and cosines and just mess around with it.

make sure to test your answer vs the original with some strange angle on your calculator.

## Answer this Question

## Related Questions

- Trig - Given that csc θ = -4 and tan θ > 0, find the exact value of...
- Math Question - Given tan θ = -8/5 and sin θ < 0, find sin θ, ...
- Math Question - Find the values of the six trigonometric functions of an angle ...
- trig - The terminal side of θ lies on a given line in the specified ...
- precalculus - #1 cscθ-cotθ #2 cosθ(tanθ-secθ) #3 tan&#...
- Math - Find sec θ and csc θ. If tan θ =3 and cos θ>0. ...
- Trigonometry - Verify the identities. 1.) SIN[(π/2)-X]/COS[(π/2)-X]=...
- precalculus - the following is a point not on a unit circle. θ → (-5,...
- Trigonometry - Could someone please help me with the following q's I'm having ...
- Math - Calculus - The identity below is significant because it relates 3 ...

More Related Questions