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[" Which tan "((pi)/(4)+theta)-tan((pi)/...

[" Which tan "((pi)/(4)+theta)-tan((pi)/(4)-theta)=2tan2 theta=(1)/(2)(a^(2)+(1)/(a^(2)))],[(x+1)=cos x=cos(x)cos2 theta=(1)/(2)(a^(2)+(1)/(a^(2)))]

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