Question

Express Cos into Cosec

Answer 1

sin²A + cos²A = 1

cos²A = 1 - sin²A

cos²A = 1 - 1/cosec²A

cos²A = (cosec²A -1) / cosec²A

Taking under root both sides,

cosA = ±√(cosec²A - 1) / cosecA

Thank you.