Which trigonometric identitiy are used to transform 2(cos(x))^2+2cos(x)sin(x) into 0?
If you want to show that [tex]2\cos^2 x + 2\cos x \sin x = 0[/tex] identically, you can't because it isn't true.
If you want to solve the equation [tex]2\cos^2 x + 2\cos x \sin x = 0[/tex] that's a different matter entirely. So what is it you want to do?
Sorry, I gave you the wrong eq. Solved in on my own here.
What's up in Singapore?
Mostly the sky, I guess. :tongue2:
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