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[" 7.Bilf "f(x)=(cos x+i sin x)(cos2x+i ...

[" 7.Bilf "f(x)=(cos x+i sin x)(cos2x+i sin2x)(cos3x+i sin3x)-(cos nx+i sin nx)" and "],[f(1)=1" ,then "f''(1)" is equal to "],[[" (a) "(n(n+1))/(2)," (b) "{(n(n+1))/(2)}^(2)quad " (c) "-{(n(n+1))/(2)}^(2)" (d) none of these "]]

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