`cot12cot102 + cot102cot66 + cot66cot12 = `

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If A + B + C =180^@ , prove that : cot B cot C + cot C cot A + cot A cot B = 1 .

If A + B + C = pi , show that cot A cot B + cot B cot C + cot C cot A = 1

cot B cot C+cot C cot A+cot A cot B=1

cot A+cot B+cot C

cot12^(@)cot102^(@)+cot102^(@)cot66^(@)+cot66^(@)cot12^(@) =

In an acute angled triangle, cot B cot C + cot A cot C + cot A cot B

If A + B + C =pi/2 , prove that : cot A + cot B + cot C = cot A cot B cot C .

cot16cot44+cot44cot76-cot76cot16=

cot 6^0 cot 42^0 cot 66^0 cot 78^0=1