$\left(11y^4z^3\right)\left(-6xyz^2\right)$
$+\sqrt{25.4}$
$x^8-2x^7-x^6$
$\tan\left(x-\frac{\pi}{2}\right)=-\cot\left(x\right)$
$\left(2x\right)^3\left(3x^2\right)$
$\tan\left(x\right)=4.576$
$\lim_{x\to0}\left(\frac{1}{x^2}-\frac{1}{sec\left(x\right)}\right)$
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