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[" 40.If "sin^(3)x" .sin "3x=sum(m=0)^(n...

[" 40.If "sin^(3)x" .sin "3x=sum_(m=0)^(n)c_(m)." cosm "x" is an identity in "x" ,where "c_(" m's are constant then the value of "n" is ")],[[" (a) "4," (b) "6," (c) "9," (d) none of these "]]

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