$\frac{d^2x}{df^2}+2\frac{dx}{df}+5x=12\cos\left(2f\right)+3\sin\left(2f\right)$

$9-\left(-10\right)$

$\left(-4x-3y+9\right)^2$

$f\left(x\right)=2\left[4x-\left(5x-6\right)\right]-8\left(x-6\right)$

$2\log_n\left(x\right)=2$

$\frac{-5\cdot\left(-8\right)}{-4\cdot5}\cdot\left(-2\right)$

$11\:.\:-3\:.\:-2\:.\:-1$