$-x^2-x-2$
$\int\:\left(4x-3\right).cosx\:dx$
$9\int\left(\cos^2\left(x\right)\right)dx$
$2x\left(2x+5y\right)+5\left(2x+5y\right)$
$y=\sqrt{2}+2\cos\left(25^{\circ}\right)$
$\left(sen\left(x\right)-cos\left(x\right)\right)^2+\left(sen\left(x\right)+cos\left(x\right)-1\right)\cdot\left(sen\left(x\right)+cos\left(x\right)+1\right)$
$2sinxcotx+1=0$
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