Same chapter3 marksDifficulty: Medium
If sin A = 3/5 and A lies in the second quadrant, find cos A and tan A.
Trigonometric Functions
3 marksDifficulty: Medium
Prove that sin 2A = 2 sin A cos A.
Original Khojo Papers practice question — not from a past board paper.
Answer
sin 2A = sin(A + A) = sin A cos A + cos A sin A = 2 sin A cos A.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It is the compound angle formula with both angles equal.
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