- Math! tan x over sin x=?

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Show that the equation cos(x) − 3x = 1 has only one real root.? Evaluate the following limits: lim from (x to 0+) integral (x to 1) 1/t dt? If r/n=1/x, n=? (rn, rt, xt, xr)? Cual es el acomodo de electrones que corresponde al atomo de cripton? Solve: 2tan(2 theta) = 1... Please explain every step and why you do them,I don't understand?