Advertisements
Advertisements
Question
If sin 3A = cos (A – 10°) and 3A is acute then A =?
Options
15°
20°
25°
30°
MCQ
Advertisements
Solution
25°
Explanation:
sin 3A = cos (A – 10°)
⇒ cos (90° – 3A) = cos (A – 10°)
⇒ 90° – 3A = A – 10°
⇒ 4A = 100°
⇒ A = 25°
shaalaa.com
Is there an error in this question or solution?
