Sum of two angels A and B is π4, find the value of (1 + tanA) (1 + tanB), Need to know the formula tan(x - y) = (tanx - tany) (1 + tanx tany) br #trigonometrybr #Class xibr #CBSEbr #JEE mainsbr #mathematics problembr #viral videobr #easy way mathematics solutionbr br