Q12 of 90 Page 7

If and then write the value of α + β lying in the interval (0, π/2).

Assume x=0






=1


(α+β) = tan-1 1



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10

If A + B = C, then write the value of tan A tan B tan C.

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If sin α – sin β = a and cos α + cos β = b, then write the value of cos (α + β).

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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