This site is excellent its really helping me understand the problems I am having.
Anyway my latest problem is:
Express sin(2x)sin(x) as a sum or difference of sin/cos terms.
Can anyone help me?
This site is excellent its really helping me understand the problems I am having.
Anyway my latest problem is:
Express sin(2x)sin(x) as a sum or difference of sin/cos terms.
Can anyone help me?
$\displaystyle as\ we\ know\ that\ \boxed{2 \sin C \sin D = \cos(C-D) - \cos(C+D) }$Express sin(2x)sin(x) as a sum or difference of sin/cos terms.
$\displaystyle therefore\ \sin 2x \sin x = \frac{1}{2} \{ \cos(2x-x) - \cos(2x+x) \} $
$\displaystyle \sin 2x \sin x = \frac{1}{2} \{ \cos x - \cos 3x \} $