$\frac{\sec^2\left(\frac{x}{2}\right)}{2\tan\left(\frac{x}{2}\right)}$

$6\sin^{2}\left(\theta\right)+\sin\left(\theta\right)-2=0$

$\left(12x-15h\right).\left(12x+15h\right)$

$\int x^3\cdot\sqrt[4]{1+6x^4}dx$

$\cot\left(x\right)^2=\frac{csc\left(x\right)^2}{1+tan\left(x\right)^2}$

$2.548\cdot\sin\left(x\right)\cdot\cos\left(x\right)=\cos\left(x\right)^2$

$2x^2-2x-8\:=\:-4$