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Tan (7pi/4)+ Tan (5pi/4) =Tan (pi+3pi/4)+ Tan (pi+pi/4) =-Tan (pi/4)+ Tan (pi/4) = 0
Gasoline density ~0.74 Kg/Liter so Weight of 15liter gasoline = 11.10 Kg Weight of steel can = 02.60 Kg Total weight = 13.70 Kg 01 Liter of gasoline=0.001 m^3 so 15 liter of gasoline=0.001*15 =0.015 m^3 so Density =mass/volume =13.70/0.015 =913.33 Kg/m^3
