Question

Evaluate: (cossquare 20 + cos square 70) + cot 25/ tan 65 + cot 5 cot 10cot 60 cot 80 cot 85

Answer 1

hi friend,


cos²20+cos²70+cot25/tan65+cot5cot10cot60cot80cot85

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

=since cos²x+sin²x=1

1+1+cot60

2+1/√3


I hope this will help u :)