$1+tan^2a$
$\frac{d}{dx}1-3x^{-2}$
$\left(2n^2-3m\right)^4$
$\lim_{x\to\pi}1-\cos\left(2x\right)$
$19m-7n+8m-7n$
$\frac{d}{dx}\sqrt{6x-5}$
$\left(1-\sin x\right)\left(1+\sec x\right)\cot x$
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