$\left(4mn\:+\:7pq\right)\:\left(4mn\:+\:x\right)$

$\frac{6\left(x^3x^4\right)}{x^{10}}$

$tan2x+1=0$

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

$2\cdot5+3\cdot2$

$\int\frac{2x}{\left(4x+x^2\right)}dx$

$\int\frac{\left(1+cosh\left(x\right)\right)}{x+sinh\left(x\right)}dx$