Question: what double angle formula can be appropriately used to derive algebraically a formula for sin theta/2? a) cos 2 theta = cos^2 theta - sin^2

what double angle formula can be appropriately used to derive algebraically a formula for sin theta/2? a) cos 2 theta = cos^2 theta - sin^2 theta b) cos (a+b) = cos a cos b - sin b sin a c) cos 2 theta = 1 - 2 sin^2 theta d) sin 2 theta = 2 sin theta cos theta

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