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sin2 =2tan cos
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Multiple post. See comments by Reiny
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sin2 =2tan cos
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sin2 =2tan cos
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If sin(θ) = -1/√2, find sin2(θ). (Recall that sin2(θ) means (sin(θ))2.)
sin2(θ) =
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If A + B + C = 180°, Prove that
Sin² (A/2) + sin² (B/2) - sin²(C/2) = 1 – 2cos (A/2) cos (B/2) sin(C/2)
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