Math, asked by sandeep86, 1 year ago

plz solve this 8 vala

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Answered by Madhuritarra

cotAcot2A-cot2Acot3A-cot3AcotA
=cotAcot2A-cot3A(cot2A-cotA)
=cotAcot2A-cot(2A+A)(cot2A-cotA)
=cotAcot2A-(cot2AcotA-1/cot2AcotA)(cot2A-cotA)
=cotAcot2A-(cot2AcotA-1)
=1

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