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[" D.Frove that "],[qquad sin^(-1)(2n sq...

[" D.Frove that "],[qquad sin^(-1)(2n sqrt(1-n^(2))=2cos^(-1)x):(1)/(sqrt(2))<=x<=1]

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y = sin^(-1)(x/sqrt(1+x^2)) + cos^(-1)(1/sqrt(1+x^2))

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