Asked by hayden

cos^2 (a+x) -sin^2 a=cos x * cos(2a+x)
Answered by Reiny
see

http://www.jiskha.com/display.cgi?id=1235346549

don't tell my I did all that work, and you didn't even look at it.
Answered by hayden
i posted a sorry. i posted this twice on that one. And i don't understand how RS=LS and thanks
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