(tan a +tan b)/(1-tan a *tan b)
tan((π/4+α)=2
(1 + tanα)/(1-tanα) = 2
1 + tanα = 2(1 - tanα)
tanα = 1/3
sin2α+(sinα)^2+cos2α
=2sinαcosα + (sinα)^2 +(1-2(sinα)^2)
=1+2sinαcosα-(sinα)^2
= 1+2(3/10) - 1/10
= 3/2 #
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