$\int4^{-x}dx$
$\int-\frac{1}{x^2+1}dx$
$-1\cdot\left(-58\right)-\left(-10+23\right)$
$\int\:\left(x-2\right)\left(2x+1\right)^3\:dx$
$\frac{1+cos^2a}{\sin^2\left(a\right)}=2\csc^2\left(a\right)-1$
$-53\cdot3$
$2sin3x=1$
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