simplify cos 3x=4 cos^3 x-3cos x?

0 ⤊

^ Means to the power

2006-10-23 05:51:18 · 3 answers · asked by D23Drama 1 in Science & Mathematics ➔ Mathematics

it is an identity.
cos3x=cosx(4cos^2x-3) another way of writing it

2006-10-23 05:53:30 · answer #1 · answered by raj 7 · 0⤊ 0⤋

You can't really simplify it because it's an identity.
If you want to verify it, try expanding cos(3x) = cos(x+2x)
and see what happens.

2006-10-23 06:11:51 · answer #2 · answered by steiner1745 7 · 0⤊ 0⤋

U've written it wrong dude! itz 3cos^2x-4cos^3x

2006-10-23 06:01:18 · answer #3 · answered by DA NAPSTER 1 · 0⤊ 1⤋