lim (-sin(x) + cos(x))
pi
x->--+
2
$$\lim_{x \to \frac{\pi}{2}^+}\left(- \sin{\left(x \right)} + \cos{\left(x \right)}\right)$$
lim (-sin(x) + cos(x))
pi
x->---
2
$$\lim_{x \to \frac{\pi}{2}^-}\left(- \sin{\left(x \right)} + \cos{\left(x \right)}\right)$$