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If 0<cos−1x<1 and 1+sin(cos−1x)+sin2(cos−1x)+sin3(cos−1x)+…∞=2, then the value of 12x2 is

Answer» If 0<cos1x<1 and 1+sin(cos1x)+sin2(cos1x)+sin3(cos1x)+=2, then the value of 12x2 is


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