Indefinite IntegrationHard

Question

The value of 2 ∫sin x. cosec4x dx is equal to

Options

A.
B.
C.
D.none of these

Solution

I = 2 ∫sin x. cosec 4 dx = 2
    Put sinx = t,  then cos x dx = dt
⇒  
          [By partial fraction]


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