In a G.P, the first term is 7, the last term is 448, and the sum is 889. Find the common ratio.

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In a G.P, the first term is 7, the last term is 448, and the sum is 889. Find the common ratio.
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sin2θ / 2sin2θ = cos2^2 theta / bracket 1 minus tan^2 theta/2)

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