$\int\left(e^{5t}\right)cos\left(4t\right)e^{-5t}dt$

$\left(x+5\right)^2-\left(5-x\right)^2+\left(x-3\right)^2-x^2-9$

$2187\cdot3$

$\frac{d}{dx}\sqrt{1-4x}$

$\left(10x^{\left(3\right)}-2x^{\left(2\right)}+5x\right)-\left(2x^{\left(2\right)}-4\right)$

$25v^2-60v+36$

$\frac{sin\left(x\right).\cot\left(x\right)}{\csc\left(x\right).\tan\left(x\right)}=\cos^2\left(x\right)$