$sin\left(90^{\circ\:}+x\right)-sin\left(90^{\circ\:}-x\right)=0$
$\left(\frac{-y^4}{-y^4\cdot2x^4}\right)$
$\left(3x\:2x\:4x\:7\right):\:\left(x\:3\right)$
$\frac{w-5}{w^2-25}$
$\left(-1\right)^{0.3333333333333333}$
$-4\left(a+5\right)\left(a-3\right)$
$\int\left(\frac{\left(x+1\right)}{\left(x^2+2x-6\right)}\right)dx$
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