MQ57 --- 1, 2, 3, π
2012-12-10 2:29 am
MQ57 --- 1, 2, 3, πDifficulty: 55% Prove that tan⁻¹1 + tan⁻¹2 + tan⁻¹3 = π.
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2012-12-10 3:34 am
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