Question

match the right hand side to the left hand side.
(sin x)(tan x cos x - cot x cos x) = 1 - 2 cos2x

Answer 1

First, look what you've got: on the left side all kinds of trigonometric functions, on the right side only a cos2x.
I would try to do the following: replace tanx with sinx/cosx, replace cotx with cosx/sinx, simplify and expand the left side.
When this is done, look at the right side.

Answer 2

Ok so just saying hi and i dont know how to do this sorta thang. Just sayin going to a concert on april 19 SO FUN! GTG BYE

Answer 3

The right side should be read as\[1-2\cos^2x\]otherwise it doesn't make any sense...