use an addition or subtraction formula to find the exact value of sin?
use an addition or subtraction formula to find the exact value of sin165 = sqrtA (sqrtB-1) / 4 A = B = find the exact value and that A and B equally.
sin165 = sin (120 +45) = sin120cos45 + Cos120sin45 = [sqrt (3) / 2] [sqrt (2) / 2] – [1 / 2] [sqrt (2) / 2] = [sqrt (2) sqrt (3) - sqrt (2)] / 4 = sqrt (2) [sqrt (3) - 1] / 4 A 2 = B = 3
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