Question

Find precise value
tan -7pi/12

Answer 1

7pi/12 = 105 degrees
first, use the identity tan(-x) = - tan(x)
tan(-7pi/12) = tan(-105) = - tan105

Answer 2

because 105 = 45 + 60, so to get the exact value of tan105 deg, use the identity tan(a+b) = {tan(a)+tan(b)}/{1-tan(a)tan(b)}
in this case, let a=45 and b= 60 deg

Answer 3

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