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[" 9.If "int(dx)/(5+4cos x)=A tan^(-1)(B...

[" 9.If "int(dx)/(5+4cos x)=A tan^(-1)(B tan x/2)+C" ,then "],[[" (a) "A=1,B=1/3," (b) "A=2/3,B=1/3],[" (c) "A=-1,B=1/3," (d) "A=1/3,B=2/3]]

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