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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. sin 5x cos x - cos 5x sin x a.cos 6x b.cos 4x c.sin 6x d.sin 4x
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OpenStudy (aravindg):
@hannahg what do you think ?
OpenStudy (anonymous):
I don't know how to start the problem :(
OpenStudy (aravindg):
do you know sin(A-B) formula ?
OpenStudy (anonymous):
no....
OpenStudy (anonymous):
sin (a-b)=sin(a) cos(b)- cos(a) sin(b)
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OpenStudy (aravindg):
\[\sin(A-B)=\sin A \cos B -\cos A \sin B \]
OpenStudy (aravindg):
doesnt this look similiar to our question ?
OpenStudy (anonymous):
ohhh i see. i'll try to solve it:) thankyou!!
OpenStudy (anonymous):
@AravindG so i got sin(4x)
OpenStudy (aravindg):
very good!! well done ! :)
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