$\left(\cos\left(x\right)\cdot\tan\left(x\right)\right)\cdot\tan\left(x\right)$
$3 \cdot 36 x ^ { 2 } - 84 x y + 49 y ^ { 2 }$
$\sec3x\cdot\cos x$
$5xy^2-15y$
$16x^2+6x+16x+6$
$\left(y+2z\right)\left(y-2z\right)$
$y=2\left(x^{\frac{1}{2}}+x^{-\frac{1}{2}}\right)arctan\left(\sqrt{x}\right)$
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