$\tan y+\cot y=\sec y\cdot\csc y$
$\frac{dy}{dx}=y=x^4-2x^3+5x^2-2x$
$\left(6x^2+9\right)\left(6x^2+8\right)$
$x^2\ge-2x+15$
$\frac{85\sin74^{\circ}}{\sin52^{\circ}}$
$\lim_{r\to-1}r^2+2$
$\lim_{x\to\infty}\left(\frac{2x^2-4x}{x-2}\right)$
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