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Calculate a53 for the sequence (a2)=(-7,-11/2,-4,5/2,-1,…)? Calculate s31 for the arithmetic sequence in which a9=17 and the common difference is d=-2.1? Does anyone else, by their own observations, think the moon looks closer to the earth than in the past? Evaluate Limit (x approaches 0) x-xcosx/sin^2(2x)? Quick precalc question: how would I solve this type of equation I just sudden forgot how to solve it.?