$-6\sin^3\left(x\right)+\frac{\sin^2\left(2x\right)}{2\cdot\sin\left(x\right)}$

$\:2a^2+6a^2$

$\sec\left(x\right)\cos^2\left(x\right)\csc\left(x\right)$

$\:\left(\:22m-18r\right)\:\left(\:22m+18r\right)\:$

$99-23+\left(-104\right)-\left(-55\right)$

$10y^4\frac{dy}{dx}=6x^5$

$3x^2-x-1=0$