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OpenStudy (kevin):
if cos x = 3/5 for 0
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OpenStudy (mathmale):
You might want to start by finding sinx x, given that cox x = 3/5. Next, think about how you might find cos 3x from sin x and cos x.
OpenStudy (kevin):
I just know, I can convert sin3x + sinx into 2 sin ((3x + x)/2) cos ((3x-x)/2) Then what should I do?
OpenStudy (kevin):
You mean like this ? |dw:1474215672194:dw|
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