$-2x^2+4x-2\:=\:-18$
$dz=e\cdot cos\left(2x\right)\cdot y$
$y=sin^2\left(x\right)+tan^2\left(x\right)+cos^2\left(x\right)$
$g\left(x\right)=3sen\left(9x+1\right)e^{-4x^6-5}$
$2sinxtanx-tanx-1+2sinx=0$
$10c+9-7c$
$6x^2+\frac{6y^2x^2}{x-2}+\frac{6y^2x^2}{y^2}$
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