Question

If A = 45° and B = 30°, verify the following:
(i)) tan(A + B) =tan A+ tan B/1-tanA ×tanB
(ii) sin(A + B) = sin A cosB + cos A sin B
(iii) cos(A-B) = cos A cos B + sin A sin B

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Answer 1

Answer:

(i) tan(A + B ) = tanA+ tan B/ 1 - tan A × tan B