If ` sin theta = 1/2 and theta ` is acute then ` (3 cos theta -4 cos^(3) theta)` is equal to

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If ` sin theta = 1/2 and theta ` is acute then ` (3 cos theta -4 cos^(3) theta)` is equal to
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Maana ki question easy tha but itti speed se kyu smjhaya aapne 🙂

ritadubey