In DeltaABC, prove that: cotBcotC+cotC...

In `DeltaABC`, prove that:
`cotBcotC+cotCcotA+cotAcotB=1`

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NAGEEN PRAKASHAN-TRIGNOMETRIC FUNCTIONS-EXERCISES 3H

In DeltaABC,prove that: sin2A + sin2B-sin2C=4cosA cosB sinC
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A+B+C=180^o, cos 2A+cos2B+cos2C=
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If A+B+C=pi, prove that : sinA+sinB+sinC= 4cos, A/2 cos, B/2 cos, C/2
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In DeltaABC, prove that: a) (sin2A + sin2B + sin2C)/(sinA+sinB+sinC) ...
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sin(B+2C)+sin(C+2A)+sin(A+2B)=4sin((B-C)/2)sin((C-A)/2)sin((A-B)/2
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If A+B+C=pi/2, prove that: sin2A + sin2B+sin2C = 4cosA cosB cosC
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If A+B+C=180, prove that: sinA+sinB+sinC=4cosA/2cosB/2cosC/2
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In DeltaABC, prove that cos^(2)A/2+cos^(2)B/2-cos^(2)C/2=2cosA/2cosB...
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In DeltaABC, prove that: tanA/2tanB/2+tanB/2tanC/2+tanC/2tanA/2=1
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In DeltaABC, prove that: cotBcotC+cotCcotA+cotAcotB=1
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In DeltaABC, prove that: tan2A + tan2B+tan2C=tan2Atan2Btan2C
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In DeltaABC, prove that: tanBtanC+tanCtanA+tanAtanB=1+secAsecBsecC
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