$\sin\left(x-\frac{\pi}{2}\right)-\sin\left(\frac{\pi}{2}-x\right)=\frac{-2}{\csc\left(x\right)}$
$3sina-3sin3a$
$\frac{dy}{dx}=\frac{y+1}{x^3}$
$\int10x^4\left(x^5+5\right)^4dx$
$x^3ex^4$
$\int cos\:\left(3x\right)\:\cdot sen\left(4x\right)\:dx$
$9y+3x+18xy+6x$
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