$\left(\tan\left(x\right)-1\right)\left(2\sin\left(x\right)-1\right)=0$

$\lim_{x\to-5}\left(\frac{x^2-25}{3x+5}\right)$

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

$5a^2-2xy-3xy-2a^2$

$-13x^2+160x+284$

$\lim_{x\to0}\left(2+\left(x-1\right)^2\right)$

$\int xe^{\left(5x^2+5\right)}dx$