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अंतराल ज्ञात कीजिए जिन पर f(x) =(4sin...

अंतराल ज्ञात कीजिए जिन पर
` f(x) =(4sinx-2x-xcosx)/(2+cosx)`
से प्रदत फलन f (i ) वर्धमान (ii ) ह्रासमान है।

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