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If |x|<1 and y=1+x+x^2+x^3+... , then w...

If `|x|<1` and `y=1+x+x^2+x^3+... ` , then write the value of `(dy)/(dx)dot`

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(1) If | [a+x ,a ,x ],[a-x, a ,x], [a-x, a ,-x] |=0 then x is