$\int\frac{1}{x\left(5+8x\right)}dx$

$0=200\left(\frac{1}{2}\right)^{\frac{t}{t\left(\frac{1}{2}\right)}}$

$\lim_{x\to\infty}\left[x-ln\left(x^2+1\right)\right]$

$3\cos2x-5\cos x=1$

$sin\left(\frac{\pi}{2}-o\right)=cos\left(o\right)$

$-8-\left(-5\right)+\left(-20\right)$

$2xy+xy$