SOLUTION: Solve: {{{sin(2x)sin(x)=cos(x)}}}

Algebra.Com
Question 174455: Solve:
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!
Solve: 


Use the identity 


Get 0 on the right side:



Factor out :



Use the zero-factor principle:



where n is any integer, positive, negative or zero.

The solutions between 0 and 360° are

30°, 90°, and 150° 


Edwin
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