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19-11-2016
Mathematics

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Find the exact value of sin22.5 (using the half angle formula)

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22-11-2016

sin(a/2) = √(1/2(1 - cos a))
sin 22.5 = sin (45/2) = √(1/2(1 - cos 45)) = √(1/2(1 - 1/√2)) = √(1/2(√2 - 1)/√2) = √(√2/4(√2 - 1)) = √(2 - √2)/2

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