👤

E(x)=✓1+cos2x +✓1-cos2x
ajutati va rog!


Răspuns :

E(x) =  1 + 2cos^2 x -1 + 1 -(1 - 2sin^2 x)
E(x) = 2 cos^2 x + 2 sin^2 x
E(x) = 2 ( cos^2x + sin^2x)
E(x) = 2 * 1 = 2