$\frac{2sin^2\left(x\right)+3cos\left(x\right)-3}{sin^2\left(x\right)}=\frac{2cos\left(x\right)-1}{1+cos\left(x\right)}$
$\left(\left(x^2+7xy\right)\left(\:3x^3-2y\right)\right)-3\left(2x^3+6x^4y\right)$
$x^{-1}+y^{.-1}$
$x'=x^3$
$-10y\cdot9z$
$\frac{x+1}{x-2}>2$
$x^2-x+6=0$
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