$\cos\left(x-y\right)-\cos\left(x+y\right)$
$\int2x\:\cos\frac{x}{4}\:dx$
$2b+2c\cdot2c+4b$
$\int\left(3x\cdot\sqrt{1+x^2}\right)dx$
$\lim_{n\to\infty}\left(\frac{n-2}{n}\right)^n$
$\tan^2x=\sin^2x\tan^2x$
$\frac{9x^2+5}{3x}$
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