$\lim_{x\to-0.9}\frac{1-\cos\left(-0.9\right)}{-0.9}$

$\lim_{h\to0}\left(\frac{\left(x+h\right)^2-3\left(x+h\right)-\left(x^2-3x\right)}{h}\right)$

$\cos-a=\cos a$

$\sqrt{182.25}$

$333-\left(-532\right)$

$3x-6=3$

$\frac{x-\arcsin\left(x\right)}{\sin\left(x\right)^3}$