$\frac { 5 x ^ { 2 } + 6 x - 10 } { x + 1 }$

$cos2x=-0.37$

$\frac{d^2}{dx^2}x^3.e^{5x}+\sqrt{2x+3}$

$\frac{12\cos^2x+11\cos\left(x\right)+2}{3\cos^2x+8\cos\left(x\right)+4}$

$-16+49a^2$

$\frac{cos^2\left(2\right)}{sin\left(2\right)}$

$\int_1^{\infty}\frac{1}{x\left(2x+5\right)}dx$