Asked by Anonymous

How do I calculate the following?

tan−1(tan(8)) − tan−1(tan(4))

Answers

Answered by Steve
Recall that the principal values of arctan are -π/2 < x < π/2

tan^-1(tan(8)) = tan^-1(-6.79) = -1.42
tan^-1(tan(4)) = tan^-1(1.157) = 0.858
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