$\int\left(\frac{cos\left(3x\right)}{sin\left(3x\right)}\right)dx$
$\frac{3}{4}mnr-\frac{1}{3};\:m=5\:;\:n=10\:;\:r=6$
$\int\left(3\cos\left(5x\right)\right)dx$
$-\frac{1}{3x^3}+c$
$-0.39-0.184$
$2-2\cos^2x=2\sin^2x$
$\int53\sqrt{x}dx$
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