Question

proving identities:
(1-3cos-4cos^2)/(sin^2) = (1-4cos)/(1-cos)

Answer 1

u can start by grouping (1-3cos-4cos^2) n use sin^2 = 1 - cos^2 for the bottom part...

Answer 2

@Loser66 @thomaster @Mertsj @Preetha

Answer 3

I am with superdavesuper.

Answer 4

i dont get him

Answer 5

try grouping 1-3x-4x^2 into (1....)*(1....)....in this case x represents sin

Answer 6

\[\frac{1-4\cos x)(1+\cos x)}{(1-\cos x)(1+\cos x)}\]

Answer 7

Perhaps you can finish it.

Answer 8

thanks @Mertsj

unrelated....wooohooo i didnt know LaTex is working again ;)

Answer 9

Wonderful, isn't it?

Answer 10

thanks

Answer 11

welcome :)