If 3*tanx*tany=1 then show that 2cos (x+y)=cos(x-y)

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Arun · Answer

3 sinx siny= cosx cosy now, 2 sinx siny= cosx cosy –sinx siny cos(x –y) –cos(x+y) = cos(x+y) now cos(x –y)= 2 cos(x+y) hence proved

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If 3tanxtany=1 then show that 2cos (x+y)=cos(x-y)

If 3tanxtany=1 then show that 2cos (x+y)=cos(x-y)

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If 3*tanx*tany=1 then show that 2cos (x+y)=cos(x-y)

If 3*tanx*tany=1 then show that 2cos (x+y)=cos(x-y)

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If 3tanxtany=1 then show that 2cos (x+y)=cos(x-y)

If 3tanxtany=1 then show that 2cos (x+y)=cos(x-y)