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फलन cot x का x के साक्षेप अवकल गुणांक ज्ञात कीजिए ।

Answer» ` d/(dx) ( cot x) = d/(dx) ((cosx)/(sin x))`
` =( sin x .d/(dx) ( cos x) - cos x. d/(dx) ( sin x))/( sin^(2)x)`
=` (sin x . ( -sin x) - cos x. ( cos x))/( sin^(2)x)`
` = ( sin^(2) + cos^(2) x)/( sin^(2)x)= 1/( sin ^(2)x)`
` d/(dx) cot x = - cos sec^(2) x . `


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