If P, Q, R are angles of an isosceles triangle and ∠P = \pi/2, then the value of (cosP/3-isinP/3)^3 + (cosQ + isinQ)(cosR – isinR) + (cosP – isinP) (cosQ – isinQ) (cosR – isinR) is equal to

WBJEE 2013 Math Solved Paper

Question : 60 of 80

Marks: +1, -0

If P, Q, R are angles of an isosceles triangle and ∠P =

, then the value of (cos

−isin

)3 + (cosQ + isinQ)(cosR – isinR) + (cosP – isinP) (cosQ – isinQ) (cosR – isinR) is equal to

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