Solution : cot 85° + cos 75° = cot (90° – 5°) + cos (90° – 15°) = tan 5° + sin 15°
cot 85° + cos 75° = cot (90° – 5°) + cos (90° – 15°)
= tan 5° + sin 15°
cot 85° + cos 75°
= cot(90° – 5°) + cos(90° – 15°)
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