Indefinite IntegrationHard

Question

If ∫(sin2x - cos2x) dx = sin (2x - a) + b, then

Options

A.a = , b ∈ R
B.a = - , b ∈ R
C.a = , b ∈ R
D.none of these

Solution

I = - cos 2x - + b = - + b
          ∴  a = - , b ∈ R

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