if cot (alpha) cot (beta) = 2 shows tht cos (alpha + beta) / cos(alpha- beta) = 1/3
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This question is so simple
Only breaks on formula
2Sin(alpha)•Sin(beta)
and
2Cos(alpha)•Cos(beta)
Only breaks on formula
2Sin(alpha)•Sin(beta)
and
2Cos(alpha)•Cos(beta)
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