Sin A+ Sin 2 A+ Sin 3 A
__________________=tan 2A
Cos A + Cos 2 A+ Cas 3 A
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Please see the attached solution
Things you must know :-
1. Formula of sin2A, sin3A, cos2A and cos3A.
2. Remember that complete solution is about taking terms common and applying formula.
Formulas Used:
→ sin2A = 2sinA cosA
→ cos2A = cos²A - sin²A or 2cos²A - 1 or 1 - 2sin²A
→ sin3A = 3sinA - 4sin³A
→ cos3A = 4cos³A - 3cosA
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