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Formula: -

(i)

Given: -

A – B = 30°………eq(1)

And,

A + B = 60°………eq(2)

Adding both the equations(1) and (2) we get,

(A – B) + (A + B) = 30° + 60°

2 A = 90°

A = 45°

Putting the Value of A in equation (1) we get,

45° – B = 30°

B = 45°– 30°

B = 15°

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