$\lim_{x\to\pi}\left(x-\pi\right)\cot\left(x\right)$
$6+9n+10$
$\lim_{x\to\infty}\left(x\cos\left(\frac{1}{x}\right)\right)$
$r^2-12r+27$
$\sin a\left(\csc a-\sin a\right)=\cos^2a$
$\frac{da}{dx}+\frac{a}{100}=10$
$2b+2c\cdot2c+4b$
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