SOLUTION: I don't really know the topic. Which expression is equivalent to sin(2x) − sinx?

Question 1169138: I don't really know the topic.
Which expression is equivalent to sin(2x) − sinx?

Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

since , use Angle-Sum Identity
where and

then you have
......factor out common
=>expression is equivalent to

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