$\frac{1}{\cos\left(x\right)\csc\left(-x\right)}$
$\left(+9\right)-\left(+5\right)+\left(-4\right)-\left(-10\right)-\left(+6\right)$
$\left(-5\right)^3x\left(-5\right)^4$
$\lim_{x\to1}\left(x^2+4\right)\left(x^2-3\right)$
$\int7\cdot\cos\left(-7x\right)dx$
$\lim_{n\to\infty}\left(1+\frac{7}{n}\right)^n$
$\left(36-\left(9\cdot3\right):3+21-3\right):\left(2\cdot2-1\right)$
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