$\lim_{x\to\frac{1}{2}}\left(4x^2-2x-6\right)$

$tan\left(arcsin\left(\frac{\left(x-1\right)}{4}\right)\right)=\frac{\left(x-1\right)}{\sqrt{16-\left(x+1\right)^2}}$

$\frac{dy}{dx}=a\left(r^2+25\right)$

$\sqrt{2.3^2.5^5}$

$\frac{dy}{dx}=7-2y$

$\int x^3\cdot e^{4x-5}dx$

$\left(3+a+b\right)^2$