$cos2x=-0.8$
$f\left(x\right)=\left(4x^2-6x\right)^2.x^3x$
$-8-2y+3y=17$
$\sqrt[3]{x}\left(-2+\sqrt[3]{x}\right)+1$
$\left(3z+z^2\right)\left(3z+z^2\right)$
$\csc^2k=1+cot^2k$
$tanxcos^2xcscx$
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