$\tan x\left(1+\cos x\right)-\sin x$
$6a+2a-5a$
$2^2-81u^6$
$x^4-75x^2$
$15x+23>13x+22$
$\frac{d}{dx}\:\frac{3x}{1-x}$
$\sqrt[4]{x^{12}}y^8$
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