$\frac{dy}{dx}=x^2e^{-4x}-4y$

$m^{3}n^{3}-125$

$2x\left(x+1\right)-3y\left(x+1\right)$

$1-\cos\left(x\right)=2\sin^2\left(x\right)$

$+5.+3.\left(-6\right).\left(-4\right)$

$\frac{\sin\:^2\left(\theta\:\right)\csc\left(\theta\:\right)\sec\left(\theta\:\right)}{\tan\:\left(\theta\:\right)}$

$sec\left(-x\right)tan\left(-x\right)cos\left(-x\right)$