Question

1- cot²45°
-------------- is equal to:
1+ cot²45°

a)cot90° b)tan90° c)cot60° d)tan60°

Answer 1

A)
1- cot²45°
-------------- is equal to: 1-1/1+1. (cot45=1)
1+ cot²45°
=>0/2=0
And in first option it is given cot90
And cot90=cos90/sin90=0/1=0
So answer is option (a)