Question

The function \(f(x)=sinx+cosx,0\leq x\leq 2\pi \) is :

• A. strictly decreasing in \([0,\frac{\pi}{4}]\)
• B. strictly Increasing in \([\frac{\pi}{4},\frac{5\pi}{4}]\)
• C. strictly decreasing in \([\frac{5\pi}{4},2\pi]\)
• D. strictly increasing in \([\frac{5\pi}{4},2\pi]\)

Answer 1

The Correct Option is D

The correct option is (D): strictly increasing in \([\frac{5\pi}{4},2\pi]\)