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OpenStudy (anonymous):
sin3 x /cos x dx... can help me solve the exercise?
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OpenStudy (zarkon):
expand sin(3x)
OpenStudy (anonymous):
I was wrong to write the equation , it really is sin^3 x /cos x dx
OpenStudy (zarkon):
use... \[\sin^3(x)=\sin(x)\sin^2(x)=\sin(x)(1-\cos^2(x))\] then use \(u\) substitution.
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