Inverse Trigonometric FunctionHard

Question

If cos-1(a) + cos-1(b) + cos-1(c) = 3π and f (1) = 2, f (x + y) = f (x) f (y) for all x, y; then a2f(1) + b2f(2) + c2f(3)  +  is equal to -

Options

A.0
B.1
C.2
D.3

Solution

-

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