$\sin\left(x\right)=\frac{1-\cos\left(x\right)^2}{1+\sin\left(x\right)}$
$x2\:-\:3\left(3\:-\:log2\:4\right)$
$6-4-20+4$
$y^2+2y$
$x^3+x^2-3x+1$
$10\::\:\left(-5\right)\:.\:6\:$
$dy=x^4y^2dx$
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