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underset(xrarr0)"lim"f(x)=2 " where" f(x...

`underset(xrarr0)"lim"f(x)=2 " where" f(x)=(asinx-bsin3x+csin5x)/(x)anda:b:c=3:2:1` , then -
the value of `2a-c` is

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