$^{\sin\left(4\right)}=1-\:\cos\left(2\right)^2$
$3mn+m+2mn$
$\lim_{x\to0}\left(\frac{z}{3-\sqrt{z-9}}\right)$
$\int7tan^2xdx$
$5a+4a^2,\:a=12$
$\log_{1-2x}8=8$
$5x^2y\cdot7xy$
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