Question

if sec A =15/7 and A+B find cos B​

Answer 1

Sec A = 15/7 Cos A = 1/SecA Therefore CosA = 1/ 15/7 = 7/15

A + B = 90 or A = 90 - B

CosA = Cos(90-B)

7/15 = SinB

CosecB = 1/SinB = 1/ 7/15 = 15/7 ...

hope it's helps.........