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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. sin 8x cos x - cos 8x sin x
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OpenStudy (jdoe0001):
http://www.pleacher.com/handley/gifs/sumdif.gif <--- notice the 2nd identity listed there
OpenStudy (anonymous):
Ok, what do I do? @jdoe0001
OpenStudy (jdoe0001):
just replace A and B by your values :)
OpenStudy (anonymous):
is it sin7x?? @jdoe0001
OpenStudy (jdoe0001):
yeap \(\bf sin (8x) cos (x) - cos (8x) sin (x)\implies sin(8x-x)\implies sin(7x)\)
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OpenStudy (anonymous):
Thank you <3
OpenStudy (jdoe0001):
yw
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