$coseca\cdot\:\:seca\cdot\:\:tana=cot^2a$
$2\sec^2x\left(1-\sin^2x\right)$
$-6k^2+39k-18$
$\left(1+x^2\right)^2\frac{dy}{dx}+2x+2xy^2=0$
$4-2m^2+4m^2+1-3m+3-m$
$\int\cos\left(3x\right)\sqrt{\sin\left(3x\right)}dx$
$2^2\cdot2^3\cdot2$
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