$20a+45$

$\frac{dy}{dx}\csc\left(x\right)=\frac{-y^{15}}{14}$

$\sqrt{1+x^2}dy-xe^ydx=0$

$\frac{w^4-y^4}{w+y}$

$-\left\{12-43-\left[35+\left(-19+52-3\right)+72\right]-15\right\}$

$\frac{tan26-tan\left(-19\right)}{1+tan26tan\left(-19\right)}$

$sin^4\left(x\right)-sin^4\left(x\right)cos^2\left(x\right)$