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If int( dx)/(5+4cosx)=I tan^(-1)(mtan(x/...

If `int( dx)/(5+4cosx)`=I `tan^(-1)(mtan(x/2))`+C, then (a)I=`2/3` (b)m=`1/3` (c)I=`1/3` (d)m=`2/3`

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