$-3d\:-\:2d\:+\:7d\:-\:5d$
$-35\cdot70$
$\cos\alpha\cdot sen2\alpha=sen\alpha$
$y'=\frac{1-y}{1+x^2}$
$\left(4m-3n-5\right)^2$
$\int9dn$
$x^3-9x^2+27-27$
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