Asked by Anonymous
Prove that tan 22 1/2 ° = √2 - 1
Answers
Answered by
Steve
since tan θ/2 = (1-cosθ)/sinθ
tan π/8 = (1-1/√2)/(1/√2) = √2-1
tan π/8 = (1-1/√2)/(1/√2) = √2-1
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