$x^2+9x^2y$

$\frac{\cot\left(x\right)}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{\cot\left(x\right)}=\sec^2\left(x\right)\cdot\csc\left(x\right)$

$\frac{\left(1+sin^2x\right)}{\left(1+cos^2x\right)}$

$4x-10\ge6x+8$

$\left(2^3x^1y^2\right)^4\left(4x^2y^2\right)^4$

$\int x^2\sqrt{4+4x^2}dx$

$5x^2y-8xy^2-9y^3;\:x=2;\:y=-1$