यदि \(f:[-\pi,\pi]\to\mathbb{R}\), \(f(x)=\cos x\), तो सही विकल्प चुनिए।
If \(f:[-\pi,\pi]\to\mathbb{R}\), \(f(x)=\cos x\), choose the correct option.
Explanation opens after your attempt
B. एकैकी नहीं हैIt is not one-one
Concept
\(\cos x\) सम फलन है। / \(\cos x\) is an even function.
Why this answer is correct
\(\cos \frac{\pi}{3}=\frac{1}{2}\) और \(\cos \left(-\frac{\pi}{3}\right)=\frac{1}{2}\), जबकि आगत अलग हैं। / \(\cos \frac{\pi}{3}=\frac{1}{2}\) and \(\cos \left(-\frac{\pi}{3}\right)=\frac{1}{2}\), while the inputs are different.
Exam Tip
सम त्रिकोणमितीय फलन के सममित मानों को अवश्य जाँचें। / Always check symmetric values for an even trigonometric function.
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