$\:\:\left(\:9m\:-\:8n\:\right)\:\left(\:6m\:+\:4n\:\right)$

$\left(6-7n\right)^2$

$\frac{dy}{dx}=4cos\left(4x\right)\left(x+11\right)$

$5+6\left|\left(12-9\right)+\left(11-7\right)\right|$

$\int_{\frac{\pi}{2}}^0x\left(\sin\left(x\right)\right)dx$

$-3x+6,\:si\:x=4$

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