$\lim_{x\to0}\left(sin\left(4x\right)\right)$

$\int\left(xae^{-ax}\right)dx$

$7x=49$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cot x}{\cos x}\right)$

$\left(12-\left(-4\right)\right)-\left|5-\left(+12\right)\right|$

$x^2-xy=2$

$\lim_{x\to2}\left(\frac{x^5-5x^2-12}{x^{10}-500x-24}\right)$