$9\left(-5\right)^2+12\left(-5\right)+6$

$2\sec\left(x\right)\csc\left(x\right)$

$\int\csc^2\:\left(0.1x\right)\:dx$

$\left(-11y^4+31y^3-8y^2\right)\left(-9y+6y^2\right)$

$-\frac{2}{x^3-x^2}$

$4x=4+4y$

$1+\tan\left(x\right)=\frac{\cos\left(x\right)+\sin\left(x\right)}{\cos\left(x\right)}$