Question

E (x )= cos x/2+sin x sa se afle E pi/3 = radical 3

Answer 1

$\it E(x) = cos\dfrac{x}{2}+sin x \\ \\ \\ E\left(\dfrac{\pi}{3}\right) = cos\dfrac{\pi}{6} +sin\dfrac{\pi}{3} = \dfrac{\sqrt3}{2} +\dfrac{\sqrt3}{2} = \dfrac{\sqrt3+\sqrt3}{2} =\dfrac{2\sqrt3}{2} =\sqrt3$