The maximum value of \(f(x) = 3{\cos ^2}x + 4{\sin ^2}x + \cos \frac{x}{2} + \sin \frac{x}{2}\) is:

The maximum value of \(f(x) = 3{\cos ^2}x + 4{\sin ^2}x + \cos \frac{

1.	The maximum value of \(f(x) = 3{\cos ^2}x + 4{\sin ^2}x + \cos \frac{x}{2} + \sin \frac{x}{2}\) is:
A.	4
B.	3 + √2
C.	4 + √2
D.	5 + √2
Answer» D. 5 + √2