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Mark the correct alternative in the following:

If A + B + C = π, then sec A (cos B cos C – sin B sin C) is equal to

B+C=

TAKE BOTH SIDE COS

Cos (B+C)=cos(π-A)

(cos B cos C – sin B sin C) = -cos(A)

sec A (cos B cos C – sin B sin C) is equal to =-1

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