Question

cos(a+b)=m cos(a-b) find tan a​

Answer 1

cos(a+b) = m cos(a-b)

cos a cos b - sin a sin b = m cos a cos b +m sin a sin b

cos a cos b - m cos a cos b = m sin a sin b + sin a sin b

cos a cos b (1-m )= sin a sin b ( 1+m )

(1-m)/(1+m) = sin a sin b /cos a cos b

tan a tan b = (1-m)/(1+m)