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(lim)(xvec-7)([x]^2+15[x]+56)/("sin"(x+7...

`(lim)_(xvec-7)([x]^2+15[x]+56)/("sin"(x+7)"sin"(x+8))=` (where [.] denotes the greatest integer function) a. is 0 b. is 1 c. is -1 d. does not exist

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