Conditional Tangent Sum Π identity (textIf A+B+C=pi, tan A+tan B+tan C=tan Atan Btan C)

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textIf A+B+C=pi, tan A+tan B+tan C=tan Atan Btan C

What each symbol means

SymbolWhat it stands for
A, B, x, a, bAs in standard NCERT treatment; domain restrictions apply for tan.

When to use this

Standard NCERT conditions; tan identities exclude odd multiples of π/2 where undefined.