$\lim_{x\to0}\left(\frac{1}{sin2x}-\frac{1}{2x}\right)$
$2\sqrt{2}+\sqrt{2}$
$\log\:\frac{x^3y^2}{\sqrt{z^5}}$
$3y+4\left(x+2y\right)$
$\sin\left(x\right)\cdot\left(2x-5\right)-\sin\left(x\right)=0$
$18-6and-18+6$
$\frac{dy}{dx}=\frac{1}{x}.\left(y-1\right)^2$
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