$100x^4y^8-81x^2y^4$

$\left(5^{\frac{1}{2}}\right)^{-3}$

$\left(2q+1450\right)^2$

$\int\:\left(e^x-ctg\left(x\right)\:\:+2\:sec^2\:\left(x\right)\right)dx$

$-8-\left(+4\right)-\left(-5\right)$

$\left(3x^2-5xy+7y^2\right)+\left(-2x^2+3xy-4y^2\right)$

$\left(-48\right)-\left(-32\right)$