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SenA = CosB
SenB = CosA
tana + tanb = sena/cosa + senb/cosb
=sena/cosa + cosa/sena
=((sena)^2 + (cosa)^2) /senacosa = 1/sena×cosa = 5/2
sena×senb = sena×cosa = 2/5 = 0.4