The maximum value of the function f(x)=1\cos x between 0 and 2\pi

×
0

×
1

×
1.5

✓
2

×
2.5
The maximum value of the function f(x)=1\cos x between 0 and 2\pi
0
1
1.5
2
2.5
When x=\pi , f(x)=1\cos x reaches its maximum value. That is
1\cos 2\pi =1(1) =2