$\int\:\frac{1}{9}x^6\left(\sqrt{\frac{9}{2}-\frac{7}{8}x^7}\right)dx$

$\left(-5\right)-\left(-6\right)\:$

$\int\frac{\left(3x^2-14x+1\right)}{\sqrt{\left(x^3-7x^2+x\right)}}dx$

$\int\frac{1}{x\sqrt{4x^2-1}}dx$

$7\left(a-3\right)=14$

$\left(-4\right).\left(+1\right).\left(+5\right).\left(-8\right)$

$\lim_{x\to0}tan\left(\frac{e^{2x}-1}{x}\right)$