$\int\:\frac{\left(sen\left(x\right)-1\right)cos\left(x\right)}{sen^2\left(x\right)-4}dx$
$\left(5x^2+x\right)\left(2x+3\right)$
$\frac{dx}{dy}=yx$
$8\cdot\frac{2}{4}$
$-x^2+9\ge0$
$cos2x\:=\:3senx\:-1$
$6+\frac{1}{2}\left(4x-10\right)=9$
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