Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If cos (A – B) = \(\frac{{\sqrt 3 }}{2}\), and cos (A + B) = 0, where A and B are positive acute angles and A \( \ge \) B, then the measures of A and B are:

1

80^o and 10^o

2

60^o and 30^o

3

70^o and 20^o

4

50^o and 40^o

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