$\lim_{x\to2}\left(\frac{1-sin\left(x\right)}{csc\left(x\right)}\right)$

$m^4+5m^2+9\:$

$u^3y^2dy+u^2y^3du+du=0$

$\cos\left(x\right)\sec\left(2x\right)=\frac{\sec\left(x\right)}{1-\tan^2\left(x\right)}$

$-82bx-71bx-53bx+206bx$

$cx^2+\:x\:+\:y^2=\:0$

$\left(2mn-5\right)\left(2mn+5\right)$