cotBcotC+cotCcotA+cotAcotB=1

If A+B+C=kpi, k inZ Then prove that, cotB.cotC+cotC.cotA+cotA.cotB=1 .

If A,B,C are the angles of DeltaABC then cotA.cotB+cotB.cotC+cotC.cotA=

If A+B+C=pi , show that : tanA+tanB+tanC=tanA.tanB.tanC Hence. Deduce the value of : cotA.cotB+cotB.tanC+cotC.cotA

If tan(A+B)=(tanA+tanB)/(1-tanAtanB) , then by applying the result tantheta=(1/cottheta) prove that cot(A+B)=(cotAcotB-1)/(cotA+cotB)

cot(A-B)=(cotA.cotB+1)/(cotB-cotA)

cot(A+B)=(cotA.cotB-1)/(cotB+cotA)

cot(A-B)=(cotA.cotB+1)/(cotB-cotA)

Prove that- cot(A+B)=(cotA.cotB-1)/(cotA+cotB)

If ((cotAcotB-1))/((cotB+cotA))=x then the value of x is