G
Guest
Guest
Prove that sinxcos^3x - cosx sin^3x = 1/4 sin 4x
I am stuck with this one. Thank you in advance!
I am stuck with this one. Thank you in advance!
- Joined
- Feb 4, 2004
- Messages
- 16,582
You've factored out the sin(x)cos(x), and replaced this with (1/2)sin(2x), right?
How far have you gotten with the remaining factor of cos<sup>2</sup>(x) - sin<sup>2</sup>(x)? You should have an identity for that bit, too....
Eliz.
How far have you gotten with the remaining factor of cos<sup>2</sup>(x) - sin<sup>2</sup>(x)? You should have an identity for that bit, too....
Eliz.