$4a^2b+8ab+16ab^3$
$7+2\cdot7$
$\cos\left(x\right)+\frac{\sin\left(x\right)}{1+\cos\left(x\right)}=\csc\left(x\right)$
$v\cdot vu^2$
$\frac{4b^3}{a^2}-\frac{9a^3}{b^2}$
$\sec\left(b\right)-\cos\left(b\right)$
$9a^2-64$
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