tana=1 sin2a=2tana/[1+(tana)^2]=2/(1+1)=1 cos2a=[1-(tana)^2]/[1+(tana)^2]=0 sin(2a+b)=sin2acosb+cos2asinb=3sinb sin2acosb=sinb(3-cos2a) tanb=sin2a/(3-cos2a) tan(a+b)=(tana+tanb)/(1-tanatanb)=(1+tanb)/...