$-18\cos\left(x\right)^2-33\cos\left(x\right)-15$
$x^2-14x=9$
$4ydy=xdx$
$\left(\frac{7}{3}x^3-4y^2\right)\left(\frac{7}{3}x^3+4y^2\right)$
$\int-\frac{sen2x}{4}\:dx$
$\int_0^{\frac{\pi}{6}}\left(sen^35x\right)dx$
$cos^2\left(3x\right)-3=-2cos^2\left(3x\right)$
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