Question

Sec 5A = cosec 7A, prove that A = 7.5°​

Answer 1

see explanation

Explanation:

Using the cofunction identity

sec(90 - x)° = cscx° , then

7A = 90 - 5A ( add 5A to both sides )

12A = 90° ( divide both sides by 12 )

A = 7.5°