Sunday

September 21, 2014

September 21, 2014

Posted by **Tasha** on Sunday, July 15, 2012 at 6:29pm.

1. (sin4x - cos4x)/(sin2x -cos2x)

2. (sinx(cotx)+cosx)/(2cotx)

- Trigonometry -
**Reiny**, Sunday, July 15, 2012 at 7:12pm1.

I am sure you mean

(sin^4 x - cos^4 x)/(sin^2 x - cos^2 x)

= (sin^2 x + cos^2 x )((sin^2 x - cos^2 x)/(sin^2 x - cos^2 x)

= (sin^2 x + cos^2 x)

=1

2.

(sinx(cotx)+cosx)/(2cotx)

= (sinx(cosx/sinx) + cosx)/(2cosx/sinx)

= (cosx + cosx)(sinx/(2cosx)

= 2cosx(sinx)/(2cosx)

= sinx

**Answer this Question**

**Related Questions**

Math please help quick - Which of the following are identities? Check all that ...

Trig - Simplify: (cosx + cos2x + cos3x + cos4x + cos5x + cos6x) / (sinx + sin2x...

Math - simplify (cos4x-cos2x)/(sin4x+sin2x) the answer choices are : cotx, tanx...

trigonometry - can i use factoring to simplify this trig identity? the problem ...

Trig - Prove the following functions: (sinx+sin2x)/(1+cosx+cos2x)=tan x (cos3x/...

Trigonometry. - ( tanx/1-cotx )+ (cotx/1-tanx)= (1+secxcscx) Good one! ...

Trigonometry - Simplify #1: cscx(sin^2x+cos^2xtanx)/sinx+cosx = cscx((1)tanx)/...

math - sin2x-cotx = -cotxcos2x Using the various trigonometric identities(i.e. ...

Math - Trig - Double Angles - Prove: sin2x / 1 - cos2x = cotx My Attempt: LS: = ...

Precalculus/Trig - I can't seem to prove these trig identities and would really ...