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[" (7) "(1)/(4)sqrt(9)tan^(-1)((sqrt(1+x...

[" (7) "(1)/(4)sqrt(9)tan^(-1)((sqrt(1+x^(2))-sqrt(1-x^(2)))/(sqrt(1+x^(2))+sqrt(1-x^(2))))=alpha," Th fors anform for "],[x^(2)=sin2 alpha" ."]

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