$\int\frac{x+3}{\left(2+x\right)^{\frac{2}{3}}}dx$

$63=56\left(1+0.004\left(x-20\right)\right)$

$\frac{d^2}{dx^2}\left(\frac{1}{2}\sin\left(2x-4y\right)\right)$

$\left(1+\sin\left(x\right)\right)\left(1-\cos\left(\frac{\pi}{2}-x\right)\right)=\cos^2x$

$86\:\left(-45\right)$

$\frac{d}{dx}\sqrt{\frac{a^2+x^2}{a^2-x^2}}$

$a^2+2ab+b^2-a^2-2ab+b^2$