जलन बे न ८ टन जा...गे TR iy (e et i eok Tl e – InterviewSolution

1.

जलन बे न ८ टन जा...गे TR iy (e et i eok Tl el e R

Answer»

To prove, 4( cot^-13 + cosec^-1√5) = π

So, to prove, cot^-13 + cosec^-1√5 = π/4

L.H.S. cot^-13 + cosec^-1√5

= tan^-11/3 + tan^-11/2

= tan^-1[(1/3+1/2) / (1-1/6)]

= tan^-1[(5/6)/(5/6)]

= tan^-1(1) = π/4 = R.H.S.

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