Question

Cosec2 67 - tan2 23 =_____
A)0 B)1 C)-1 D)2

Answer 1

Cosec2 67- tan2 23

=cosec2 67-tan(90-67)

= cosec2 67 - cot2 67

=1

Answer 2

1

Because:cosec^2 67 - cos^2(90-67)

=Cosec^2 67 - cos^67

= 1

The option B is right