$\frac{d}{dx}2x+9$

$3a+13b-15c+8c-4a-3b$

$\left(4\left(\frac{15}{2}\right)+3\right)+\left(6\left(\frac{15}{2}\right)-12\right)$

$\left(sin\left(x\right)+cos\left(x\right)\right)^2tan\left(x\right)$

$-2\left(5+3-\left(2+4\left(5-6\right)-3-5\right)\right)$

$-3\:.\:-80\:.\:-27\:$

$2\left|3\right|+15$