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Evaluate the following limits: lim from (x to 0+) integral (x to 1) 1/t dt? Platinum has atomic radius 139 pm and crystallizes with a face-centered cubic unit cell. Calculate its density.? Evaluate the limit: lim(x->0+) of integral(x to 1) 1/sqrt(t) dt? In triangle ABC,prove that tanA+tanB+tanC=tanAtanBtanC? Can someone explain step by step !?