$\frac{cot\left(x\right)+tan\left(x\right)}{-sec\left(x\right)}$
$7^4\cdot7^{-4}$
$\frac{x}{258}<5$
$3^2-2^{-2}-4^{-6}$
$-\frac{15}{2}c+\frac{14}{3}c-2a+11a-12-3k$
$\int x^2e^{-3x}dy$
$1200+\int_2^7r\left(t\right)dt$
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