$\cos2y-\sin2y\cdot\csc\left(y\right)=2\cos^2\left(\frac{y}{2}\right)$
$9x^2+12x^3+4x^2$
$\frac{27x^3+8}{x^2-16x+28}$
$4a+2a-7+5$
$\frac{x}{x+5}=\frac{6}{5}$
$\lim_{x\to0}\left(\frac{x^2-3x}{x^2-9}\right)$
$x^3-c^3$
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