$\int\:39\:cos^2\left(50x\right)dx$
$f\left(x\right)=\left(5x-x^2-cos\left(3x\right)\right)^2$
$\int\frac{2x^3-3x^2+2}{x+1}dx$
$\sin\left(4\right)x=-\cos\left(1\right)^2x+1$
$4x-9=2x+3$
$\left(19^8\right)^4$
$\int-4\left(5y-3\right)^{-3}dy$
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