$x+y=41$
$\int sen\left(ax\right)\cos\left(ax\right)dx$
$\cos^2\left(x\right)-\sin^2\left(x\right)=\frac{1}{2}$
$b^2a^8-e^2$
$6x-2x^2=0$
$\left(7+z\right)\left(7-z\right)$
$2e^2-2e^{-x}$
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