$\int_{-\pi}^0\left(sen\left(20x\right)cos\left(15x\right)\right)dx$
$x^4y+y^4x$
$\frac{2.50}{3.50}$
$cos3x\:=4cos^3x-3cosx$
$\lim_{x\to\frac{\pi}{2}}\left(\sec^2\left(x\right)-\tan^2\left(x\right)\right)$
$1+6-11-84+28+240$
$2x^2+2x+11=0$
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