tan2A.tan3A.tan4A=1 then find A
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tan(90-2A)×tan(90-3A)×tan(90-4A)=1
cot2A×tan (90-3A)×tan(90-4A)=1
(90-3a)×tan (90-4a)=2a
cot2A×tan (90-3A)×tan(90-4A)=1
(90-3a)×tan (90-4a)=2a
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