$\int_{\frac{\pi}{2}\:}^{2\pi\:}\left(sen3x\right)dx$
$4sen\left(x\right)+3=0$
$\left(4-5x^2\right)\left(3-2x+6x^2\right)$
$\int\frac{x-3}{\left(x^2-17x-28\right)}dx$
$2x^2\left(x+y\right)$
$\sin^2\left(x\right)+cos\left(2\cdot x\right)=\frac{1}{3}$
$30\cdot6$
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