$-\left|45\right|$
$\frac{1+\cos\left(x\right)+\sin\left(x\right)}{1-\sin\left(x\right)+\cos\left(x\right)}=\frac{1+\sin\left(x\right)}{\cos\left(x\right)}$
$\frac{x^4+1}{x^4+4x^3}$
$\log\left(x\right)=-4.87$
$\left(\frac{1}{4}x+\frac{2}{3}y\right)^2$
$4^3\cdot4^{-1}$
$\left(4x^2\:+\:4\right)^2$
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