defence exam Army Havildar SAC Mock Test Series 2025 Mathematics Differential Calculus Applications of Derivatives
Comprehension Passage
Direction : Consider the following for the items that follow :
Let f(x) = cos2x + x on [-π/2, π/2].
What is the least value of f(x)?
1
\(-\left(1+\frac{\pi}{2}\right)\)
2
\(-\left(\frac{1}{2}+\frac{\pi}{2}\right)\)
3
\(-\left(1+\frac{\pi}{4}\right)\)
4
\(-2\left(\frac{1}{2}-\frac{\pi}{4}\right)\)