$9y^2-9x^2$
$w+3z+5w+2z$
$-23ab^2+-20ab^2$
$\frac{\left(4-2sec^2\left(x\right)\right)}{sec^2\left(x\right)}$
$sin2x-2sinx-3=0$
$5x+2x^2-y+2x-x^2+2y$
$sin\left(2x\right)+cos\left(2x\right)+\sin\:^2\left(x\right)=sin\left(x\right)cos\left(x\right)$
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