Tuesday

October 21, 2014

October 21, 2014

Posted by **Carl** on Monday, March 26, 2012 at 1:09am.

sin(x–y)sin(x+y)=sin^2(x)–sin^2(y)

- trig -
**Steve**, Monday, March 26, 2012 at 11:00am(sinx cosy - cosx siny)(sinx cosy + cosx siny)

= sin^2x cos^2y - cos^2x sin^2y

= sin^2x(1-sin^2y) - (1-sin^2x)sin^2y

= sin^2x - sin^2x sin^2y - sin^2y + sin^2x sin^2y

= sin^2x - sin^2y

**Answer this Question**

**Related Questions**

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

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

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

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

algebra - Can someone please help me do this problem? That would be great! ...

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

Math - Calculus - The identity below is significant because it relates 3 ...

MathsSs triG - Consider sin(x-360)sin(90-x)tan(-x)/cos(90+x) 1.A.SIMPLIFY sin(x-...