maths
posted by pooja on .
cos(a+b)=m(cos(ab) then tan a=?

Expand both sides using sum of angles formula:
cos(a+b)=cos(a)cos(b)sin(a)sin(b)
cos(ab)=cos(a)cos(b)+sin(a)sin(b)
Divide by cos(a) on both sides and solve for tan(a) to get:
tan(a)=cot(b)*(1m)/(1+m)
Check me.