Question

Show all working to proving these Trig Identities.
(For the sake of learning)

1.) CosA / SecA - TanA = 1 + SinA
2.) Cosx - Cos3x / sin3x - sinx = tan2x

Answer 1

I dont think 1) is true

Answer 2

it is

Answer 3

written funny

Answer 4

\[\frac{ \cos x }{ \sec x-\tan x} = 1+\sin x\]

Answer 5

Oh...... i thought it was