$\int_{\frac{\pi}{4}}^{\frac{\pi}{3}}\cot\left(x\right)\left(\ln\left(\sin\left(x\right)\right)\right)dx$

$-42m^6n^4+49n^8$

$x^2+6=24$

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

$\left(\frac{3}{7}a-9b\right)\left(\frac{7}{2}a+6b\right)$

$5x-2=8$

$-5y+-6=9$