Question

sec4A=cosec(A-20) ,then find A​

Answer 1

$\sec(4a) = \csc(a - 20) \\ = > \sec(90 - 4a) = \csc(a - 20) \\ = > \csc(4a) = \csc(a - 20) \\ = > 4a = a - 20 \\ = >4 a - a = 20 \\ = > 3a = 20 \\ = > a = \frac{20}{3}$