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What is the range of (f(x)=\frac{3}{2+\cos x})?फलन (f(x)=\frac{3}{2+\cos x}) का परिसर क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: ( [1,3] )( [1,3] )
Since (\cos x\in[-1,1]), (2+\cos x\in[1,3]), so (f(x)\in[1,3]). The order may reverse when taking reciprocals.(\cos x\in[-1,1]) इसलिए (2+\cos x\in[1,3]), अतः (f(x)\in[1,3])। reciprocal लेते समय क्रम उलट सकता है।
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