Question

Show that 1/cosx-cosx=(tanx)(sinx)

Answer 1

Add the 2 expressions on the LHS and use the identity sin^2 + cos^2 =1

Answer 2

I'm sorry I still don't understand?

Answer 3

Can u add the 2 expressions on the left side?

Answer 4

yeah you get cosx/cosx

Answer 5

\[sin^2x+\cos^2x=1\]\[\tan^2x+1=\frac{1}{\cos^2x}\]\[\sin x \tan x + \cos x=\frac{1}{\cos x}\]

Answer 6

I have never done a kind of problem that way before..

Answer 7

But you fully understand this way?

Answer 8

no I don't understand it at al