#14 Precalculus questions

label Mathematics
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May 15th, 2015

sin 15 = sin (45-30) = sin 45 cos30-cos 45 sin 30 = (1/sqrt(2))*sqrt(3)/2-(1/sqrt(2))*(1/2)

= (1/sqrt(2))(sqrt(3)-1)/2

multiply numerator and denominator by sqrt(2) we see it is A

May 15th, 2015

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