यदि `A+B+C=2pi` हो तो सिद्ध कीजिए कि -
`"tan"A/2+"tan"B/2+"tan"C/2="tan"A/2."tan"B/2."tan"C/2`.

If A+B+C=pi prove that "tan"A/2"tan"B/2+"tan"B/2"tan"C/2+"tan"C/2"tan"A/2=1

v) tan(A/2)tan(B/2)+tan(B/2)tan(C/2)+tan(C/2)tan(A/2)=1

(tan(B/2)-tan(C/2))/(tan(B/2)+tan(C/2))

If A+B+C=pi, then the value of (tan ""A/2 tan ""B/2+tan ""B/2 tan ""C/2 + tan ""C/2 tan ""A/2) is-

(b-c)/(a) = (tan B/2-tan( c/2))/(tan B/2+tan C/2)

If A+B+C=180^(@) , prove that: "tan"2A+ "tan"2B+"tan" 2C="tan" 2A "tan"2B tan 2C

If A+B + C = pi , show that : tan""(A)/(2) tan""(B)/(2) + tan""(B)/(2)tan""(C)/(2)+tan""(C)/(2)tan""(A)/(2) = 1 .

If A+B+C=pi , prove that : tan( A/2) tan (B/2) + tan (B/2 )tan (C/2)+ tan( C/2) tan (A/2) =1