Q30 of 143 Page 6

If A, B and C are interior angles of a triangle ABC, then =.

Given,


A, B and C are the interior angles of ∆ ABC,


Therefore,


A + B + C = 180°


B + C = 180° - A




Now put this value in the given equation we get,



[∵ sin (90 – θ) = cos θ]

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