Saturday

February 28, 2015

February 28, 2015

Posted by **Anonymous** on Monday, May 3, 2010 at 10:10am.

1-sin^2è/cosè= cosè

sin^4è-cos^4è=2sin^2è-1

- trig -
**Anonymous**, Monday, May 3, 2010 at 10:16amthat e symbol is suppose to be theta.

- trig -
**Reiny**, Monday, May 3, 2010 at 12:11pmLS

= 1-sin^2Ø/cosØ

= cos^2 Ø/cos

= cos Ø = RS

Ls

= sin^4Ø-cos^4Ø

= (sin^2Ø + cos^2Ø)(sin^2Ø - cos^2Ø)

= 1( sin^2Ø - (1-sin^2Ø))

= 2sin^2Ø - 1

= RS

**Answer this Question**

**Related Questions**

Precal - I do not understand how to do this problem ((sin^3 A + cos^3 A)/(sin A...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

tigonometry - expres the following as sums and differences of sines or cosines ...

Precalculus - Verify the identities. Cos^2x - sin^2x = 2cos^2x - 1 When ...

Trig Identities - Proving identities: 1) 1+ 1/tan^2x = 1/sin^2x 2) 2sin^2 x-1 = ...

trigonometry (please double check this) - Solve the following trig equations. ...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

Trig! - The identities cos(a-b)=cos(a)cos(b)sin(a)sin(b) and sin(a-b)=sin(a)cos(...

Trig - Are any of these three problems identities? 1. Cos^2x-sin^2x=1-2sin^2x 2...

Trig - Are any of these three problems identities? 1. Cos^2x-sin^2x=1-2sin^2x 2...