$-10\left(1-7k\right)-\left(9k=2x\right)$
$0.3698\cdot1.56$
$\frac{1}{1-\frac{1}{1-\frac{1}{1-cot^2a}}}=cot^2a$
$\int tan^32x\cdot sec^32xdx$
$\lim_{x\to0}\left(\frac{x^2-x}{\left|x\right|}\right)$
$\int\left(x\left(x+10\right)^9\right)dx$
$\sqrt{4^2}+\sqrt{x^2}$
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