$\frac{\tan\left(x\right)}{\csc\left(x\right)}+\frac{1}{\sec\left(x\right)}$

$b^3.b^7.b^{12}$

$\sin\left(x\right).\cos\left(x\right)+\frac{-\cos\left(x\right).\sin\left(x\right)^2}{\sin\left(x\right)}$

$\frac{d}{dx}\left(x^2+5y^2=3\right)$

$\left[\left(3\right)-\:\left(-2\right)\right]\:-5$

$10x^3+2x^2-x$

$\left(x-12\right)-15\left(2x-1\right)<15$