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OpenStudy (anonymous):
simplify sin 2x + sin x - 2
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OpenStudy (anonymous):
do you know the rule of sin2x?
OpenStudy (anonymous):
I just know the Pythagorean identity cos^2(theta)+sin^2(theta)=1
OpenStudy (anonymous):
ok it's rule \[\sin2\theta=2\sin thetacos \]
OpenStudy (anonymous):
sin 2x=2sinxcosx
OpenStudy (anonymous):
can you tell me what is the next step ? @sfmath
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