$\frac{18x^2+10x}{2x^4}$

$x^2-\frac{4}{3}x+\left(-\frac{2}{3}\right)^2$

$5x^2-30x+49$

$f\left(x\right)=-2x\left(x-2\right)\left(x-5\right)$

$\left(1+\sin\:\left(\alpha\:\right)\right)^'\left(1-\sin\:\left(\alpha\:\right)\right)^'=\frac{1}{\sec\:^2\left(\alpha\:\right)}$

$\cos\left(\frac{2\pi}{9}\right)\cdot\cos\left(\frac{\pi}{18}\right)+\sin\left(\frac{2\pi}{9}\right)\cdot\sin\left(\frac{\pi}{18}\right)$

$17\:-\:11y\:+\:4y\:$