$x2-2x-3\:\:4x-12$

$8\cos\left(1.5\right)$

$\left(\frac{7}{t-1}\right)-\left(\frac{14}{t^2-1}\right)$

$25b^2d^2-10bd^2+1$

$\frac{1+\sin\left(x\right)}{1-\sin\left(x\right)}+\frac{\sin\left(x\right)-1}{1+\sin\left(x\right)}=4\sec\left(x\right)\tan\left(x\right)$

$\lim_{x\to0}\left(\frac{tan2x-2\cos\left(x\right)}{x^3}\right)$

$50x+43>-11x+70$