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OpenStudy (anonymous):
integ_dx/(4-cosx)=?
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OpenStudy (anonymous):
Do you mean \( \huge\int \frac{dx}{4-\cos x} \) ?
OpenStudy (anonymous):
yes.
OpenStudy (anonymous):
help me please.it's important
OpenStudy (anonymous):
HINT:Put \(t = \tan (x/2) \)
OpenStudy (anonymous):
ok.thanks.
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OpenStudy (anonymous):
It's the "The world's sneakiest substitution"-Michael Spivak
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