$\lim_{x\to1}\left(\frac{1-x^2}{\left(1+ax^2\right)-\left(a+x^2\right)}\right)$

$\left(-\frac{1}{31200}\right)+\left(\frac{1}{3307.5}\right)+\left(\frac{1}{1575}\right)+\left(\frac{1}{360}\right)+\left(\frac{2}{985.359375}\right)+\left(-\frac{1}{2450}\right)+\left(-\frac{1}{11088}\right)$

$z=2x+3y$

$\frac{10-7i}{-2+4i}$

$-4\sin^2x=-1$

$\frac{20a^3c^4d^2}{-5a^3c^3}$

$\int_1^{\infty}\left(\frac{sin\left(x\right)lnx}{x^3}\right)dx$