1.

cot 250tan 65耳何何ATTeTQ : (cos? 20° + cos? 70°) +cot 5° cot 10° cot 60cot 80° cot 85°

Answer»

cos²20+cos²70+cot25/tan65+cot5cot10cot60cot80cot85

=cos²20+(sin20)²+tan65/tan65+cot5cot10cot60tan10tan5

=since cos²x+sin²x=1

1+1+cot60

2+1/√3

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