Question

How do I solve this problem?

Answer 1

Take a look at the sec 0 - tan 0 side

sec 0 is 1 / cos 0

tan 0 is sin 0 / cos 0 :

(1/ cos0) - (sin0 / cos0)

Subtraction of fractions with same denominators

= 1 - sin 0 / cos 0

Explanation: