$\left(x+y\right)\:2$
$\frac{\sin\left(a\right)+\sin\left(2a\right)}{\sec\left(a\right)+2}$
$\int\:\frac{x+1}{\left(x^2-4x+6\right)^2}dx$
$x-2<1$
$\left(3x+9\right)\left(3x-9\right)=9x^2-81$
$c^2-13c+14$
$\frac{dy}{dx}\left(y^2+xy^2\right)=1$
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