[Ina Delta ABC," if "C" is a right angle...

[Ina Delta ABC," if "C" is a right angle,then "tan^(-1)((a)/(b+c))+tan^(-1)((b)/(c+a))],[[" (a) "(pi)/(-)," (b) "(pi)/(4)," (c) "(5 pi)/(2)," (d) "(pi)/(6)]]

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