y=(cot x)tanx হলে dydx ?
A
(cot x)tanx [sec2x {In (cotx)-1}]
B
(cot x)tanx [secx {In (cotx)2-1}]
C
(cot x)tanx [sec2x {In (cotx)2-1}]
Correct Answer: (cot x)tanx [sec2x {In (cotx)-1}]