$y=-\frac{3e^{-x}}{2}$
$x^2=y^2+c$
$\left(x+1\right)\left(x+2\right)-\left(x+2\right)\left(x+3\right)-2\left(x+5\right)\left(x-2\right)-x$
$\int\left(5x-7\right)^8dx$
$tan\left(x\right).sen\left(x\right)=sen^2x.\:secx$
$9y^2+6y+4\cdot3y+2$
$-87-68$
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