Question

If cos (A-B) = root3 and sin (A + B) = 1, then the value of A and B, respectively are
2
(a) 45° and 15° (b) 30° and 15° (C) 60° and 30° (d) none of these

Answer 1

sin(A+B)=1

sin(A+B)=sin90

A+B=90

(A+B ) is only satisfy by option (c) or (d)

Let option 3 is correct

Cos(60-30)=cos30=√3/2

But,Cos(A-B)=√3

Hence, option (c) is wrong.

Correct answer (d) i.e; none of these.

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Sahil kumar