- Find the differential of tan^-1 (4x/sqrt(1-4x^2))? the ans is 2/(1+12x^2)?

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What two variables are needed to describe a normal curve? (Statistics)? Find a basis of the subspace of R4 that consists of all vectors perpendicular to both [1,0,0,7] and [0,1,-9,5]. Please show work!? The odds against nolan getting promoted are 1:9 find the probability that nolan gets promoted? Controversial question of the day: Should people have the right to die? Find the point (x,y) of x^2+14xy+49y^2=100 that is closest to the origin and lies in the first quadrant.?