$4^4\cdot4^{-7}$
$y=7x^{-x}$
$x^2+\frac{1}{3}x=3$
$-\left(-2\right)-\left(-3\right)\cdot\left(\left(-2\right)-4\cdot\left(-3\right)\right)-\left(\left(-5\right)-6\right)$
$\cot\left(x\right)\sin\left(x\right)+\cos\left(x\right)=2cos\left(x\right)$
$\sin\left(42\right)+\cos^2121$
$\left(\frac{x^5}{10}-\frac{x^4}{4}-\frac{17x^3}{6}+15x^2-1\right)$
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