$\frac{6x^4-19x^3-12x^2+43x+30}{3x^2-5x-6}$

$-11\times6$

$\int-7sin\left(x\right)\sqrt{cos\left(x\right)}dx$

$2+2+2+2+2+2+2$

$\sqrt{72m^2n}-\sqrt{98m^2n}$

$\left(-71\right)+\left(+89\right)+\left(-752\right)+\left(+1569\right)+\left(+6\right)+\left(-2989\right)+\left(+643\right)+\left(-986\right)$

$\lim_{x\to0}\left(\frac{4x^2-7x}{\left(ln\left(x\right)\right)^2}\right)$