Mathematics
If sin(A + B) = = cos(A - B), 0° < A + B ≤ 90° (A > B), find the values of A and B.
Trigonometrical Ratios
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Answer
Given,
⇒ sin(A + B) =
⇒ sin(A + B) = sin 60°
⇒ A + B = 60° ……….(1)
Also,
⇒ cos(A - B) =
⇒ cos(A - B) = cos 30°
⇒ A - B = 30° ……….(2)
Adding, (1) and (2), we get :
⇒ (A + B) + (A - B) = 60° + 30°
⇒ A + A + B - B = 90°
⇒ 2A = 90°
⇒ A = 45°.
Substituting value of A in (1), we get :
⇒ A + B = 60°
⇒ 45° + B = 60°
⇒ B = 60° - 45°
⇒ B = 15°.
Hence, A = 45° and B = 15°.
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