सिद्ध कीजिए कि फलन \( f(x)=\cos x \) \( (0, \pi) \) में निरन्तर ह्रासमान फलन है।
सिद्ध कीजिए कि फलन \( f(x)=\cos x \) \( (0, \pi) \) में निरन्तर ह्रासमान फलन है।
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