Asked by Prem

(1 + tan 21 degrees)(1 + tan 28 degrees) * (1 + tan 24 degrees) * (1 + tan 17 degrees) = 4

3 years ago

Answered by oobleck

if you google
(1 + tan 21°)(1 + tan 28°)(1 + tan 24°)(1 + tan 17°) = 4
you will find several proofs

3 years ago

Answered by Trigonometry

Compound angel

3 years ago

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