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

$\frac{\cos\left(x\right)+\sin\left(x\right)-\sin^3\left(x\right)}{sin\left(x\right)}=\cot\left(x\right)+\cos^2\left(x\right)$

$\lim_{x\to+\infty}\left(\frac{4x^3+1}{2x^x+x}\right)$

$6x^2-13x-5=0$

$y^2+21y+68$

$3x^2-30x=0$

$\left(23.80952\right)\int_{0.01}^{0.05}x^2dx$