Question

if a=b=60°,prove that tan(a-b)=tan a-tan b/1+tan a.tan b

Answer 1

solve further u will get your answer

Answer 2

LHS=tan(a-b)=tan(60-60)=tan0=0

RHS=tan a-tan b/(1-tan a.tan b)
=tan60-tan60/(""")
=0/(""")
=0

so, LHS=RHS(proved)