$\int\frac{\sqrt{x^2-64}}{x^4}dx$
$cos\left(\frac{\pi\:}{3}+x\right)+cos\left(\frac{\pi\:}{3}-x\right)=cos\left(x\right)$
$4x^2-8x=8$
$\int x\cdot sen^2\left(5x+1\right)dx$
$3x^2+6x+1$
$\left(\left(\sin\left(x\right)+\cos\left(x\right)\right)^2-1\right)\cot\left(x\right)=1$
$\frac{dx}{dt}+x=sin\left(5t\right)$
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