$18\cdot7$

$\frac{-152a+224}{3\left(3a^2-6a+8\right)}$

$25-196x^4$

$3tan^2x+16\left(tanx+5\right)$

$-6\left(v-2\right)+1$

$\left(p-2x\right)^2$

$\frac{1}{2}sen\left(2x\right)+\frac{cos\left(x\right)^2}{sen\left(x\right)}=cot\left(x\right)\cdot cos\left(x\right)+cot\left(x\right)\cdot sen\left(2x\right)$