How we calculate tan C + tan D
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tan (C+D ) =( tan C+tan D)/(1-tanC tanD)
thus
tanC +tan D = (1-tan C tan D) tan(C+D)
in this way we can calculate value of tan C+tanD
thus
tanC +tan D = (1-tan C tan D) tan(C+D)
in this way we can calculate value of tan C+tanD
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