11bhai seedhi si baat hai
jo intervals given hain check a+ and a- usse pata lag jaaega nahin to remember the inverse formulaes
if tan^{-1}\left(\frac{1-cosx}{sinx} \right) then dy/dx=
a) { 1/2 x belongs to R -{n∩} n belongs to I and -1/2 x={n∩} n belongs to I }
b){ 1/2 x belongs to R -{n∩} n belongs to I and does not exist for x = {n∩} n belongs to I}
c) { -1/2 x belongs to R -{n∩} n belongs to I and does not exist for x = {n∩} n belongs to I}
d) none
after solving i got the answer is 1/2 but how to decide with the intervals among the options
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