i) 3 sin 10° - 4 sin 3 10°
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Answer
3 sin 10° - 4 sin 3 10°=1/2
Explanation
3sinA-4sin^3A=sin3A
Given,
i) 3 sin 10° - 4 sin 3 10°
so,sin3A i.e sin 30=1/2
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