$\frac{1-sen^2x}{sec^2x}\:=\:cos^2x$
$\int\left(\left(\frac{x}{3}\right)-5\right)^3\left(\frac{1}{3}\right)dx$
$-8-\left(2-7\right)$
$1.29x^2y+1.8xy+1.55x^2$
$x^3dx-\left(y+1\right)^2dy$
$\int-2x^{-4}\ln\left(x\right)dx$
$52^2-253-31$
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