Question

please answer it fast please ​

Answer 1

given : A,B and C are interior angles of atriangle

Step-by-step explanation:

A+B+C= 180

divide 2 on both sides

A+B+C / 2 = 180/2

(A+B/2) + C/2 = 90

A+B/2. = 90-C/2

applying tan on both sides

tan(A+B/2) = tan (90-C/2)

tan (A+B/2) = cot c/2 { since tan ∅ = cot (90-∅)

hence proved ..

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