$5a^2+\frac{3}{4}b^2-cd^2+\frac{7}{5}a^4b^5\:;\:a=2,\:b=1,\:c=-2,\:d=4$

$\left(-\left(-\left(-3-20\right)+5\cdot\left(4-8\right)+\left(-6+4\right)\cdot2\right)\right)$

$\lim_{x\to1}\left(\sin\left(x\pi\right)\right)$

$\int\frac{cot^2\left(x\right)}{\sin^2\left(x\right)}dx$

$100x^2+100x+25$

$\left(4\:-\:b\right)\:^2$

$x^2+10x-29$