If A+B = pi/2 then evaluate tanB +2tan(A-B)=? #trigonometry #class11

If A+B = pi/2 then evaluate tanB +2tan(A-B)=? #trigonometry #class11

Trigonometry Help: If A+B=π/2+kπ,k ϵ Z ,prove that tanA=cotgB

If tanbeta=(tan alpha+tan gamma)/(1+tanalphatanbeta), prove that sin2beta=(sin2alpha+sin2gama)/1+si