Evaluate Cot 5°. Cot 60°. Cot 80°. Cot 85°
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Your question is incorrect
There should be "cot20°" at last of the question
Question: cot5°cot60°cot85°cot80°cot20°
Answer:
=( cot5°× cot85°)×cot60°
(cot80°×cot20°)
=[tan (90-85)°cot85°](1/under root 3)[tan (90-20)°cot20°]
=tan85°×cot85°×1/ under root 3×tan20°×cot20°
=1×1/under root 3×1
=1/under root 3 (ANS)
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