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[" If "L(r)=int sin xd(i^(r)x)," where "...

[" If "L_(r)=int sin xd(i^(r)x)," where "i=sqrt(-1)," then "sum_(r=1)^(4)L_(r)is(n in N)],[[" (a) "-cos x+C," (b) "cos x+C," (c) "0]]

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