$\frac{sin\left(a\right)}{1+cos\left(a\right)}=tan\left(\frac{a}{2}\right)$
$12x^2+60x-75$
$2m-4m-7m$
$-\left(30+y+z\right)^2$
$\left(9d^4+36\right)y=0$
$\left(15u^3\right)-2\left(15u^3\right)\left(4v^2\right)+\left(4v^2\right)$
$316.09\cdot10$
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