find the value of cot (-15°)
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We know that Cot(A - B) = (CotACotB+1)/(CotB-CotA)
cot 15° = cot (45° - 30°) = (Cot 45°Cot 30°+1)/(Cot30°-Cot 45°)
= ( √3 + 1) / ( √3 - 1)
cot 15° = cot (45° - 30°) = (Cot 45°Cot 30°+1)/(Cot30°-Cot 45°)
= ( √3 + 1) / ( √3 - 1)
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