Question

F(x) =(2cos x+1) find the maximum and minimum value ​

Answer 1

Max value of F(x) by differentiating

-2sinx =0

Sin x =0

x=0

Hence max value is

2Cos0 +1

=2×1+1

=3

Now minimum value of cos x is -1

hence minimum value is

2×-1+1

=-1