$\lim_{x\to0}\frac{\left(\sqrt{1-cos\left(x\right)}\right)}{x}$
$2\cos^2x=\sin x$
$m^2-6m+9^2$
$xy+5=0$
$tan\left(a\right)sin\left(a\right)+sec\left(a\right)cos^2\left(a\right)$
$x^9y-y^{10}$
$\int_0^ncos\left(\frac{x}{2}\right)dx$
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