Here's the question you clicked on:
burhan101
trig identity
\[\huge \frac{ sinx-2sinx^3 }{ 2\cos^3x-cosx } = tanx \]
is this proving? or simplifying?
the left side is confusing me to the max
|dw:1353299892857:dw|
The first step I factored out sinx and cosx The second step I used the double angle formula for cos2x
o.O you made it look so easy, how are you so good at these ?
Its all practice, I suggest you don't ask other people and actually spend at least 5 or 10 minutes trying to figure it out. You get better as you do more
i do try them all out before asking but i ALWAYS get stuck :S