$dr-2dx=0$

$\cos^2x+2\sin x+2$

$2\cdot\left(16+45-40\right)\cdot2$

$\frac{e^{x^5+x}\sin\left(x\right)^2}{\sqrt{x^2+1}}$

$\sin\left(90\right)+4\cos\left(0\right)-2\sin\left(270\right)$

$20a^5+15a^3b^2$

$\frac{\tan\left(x\right)-1}{1-\frac{\sin\left(x\right)}{\cos\left(x\right)}}$