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If 0ltcos^(-1)x lt 1 and 1+sin(cos^(-1)x...

If `0ltcos^(-1)x lt 1` and `1+sin(cos^(-1)x)+sin^(2)(cos^(-1)x)+sin^(3)(cos^(-1)x)+…….oo=2`, then the value of `12x^(2)` is

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