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if cotxcot7x+cotxcot4x+cot4xcot7x=1 then general solution of x is?
Multiplyboth sides by tanx tan4x tan7x, tanx+tan4x+tan7x=tanx tan4x tan7x Now tan(A+B+C)=( tanx+tan4x+tan7x-tanx tan4x tan7x)/(1- tanxtan4x-tan7x tan4x-tanx tan7x) So, tan(x+4x+7x)=0, implies x+4x+7x=n pi where n is any integer
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