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x=sqrt(a^2cos^2alpha+b^2sin^2alpha)+sqrt...

`x=sqrt(a^2cos^2alpha+b^2sin^2alpha)+sqrt(a^2sin^2alpha+b^2cos^2alpha)` then `x^2=a^2+b^2+2sqrt(p(a^2+b^2)-p^2)`, where p is equal to (a) `a^2cos^2alpha+ b^2sin^2alpha` (b)`a^2sin^2alpha+b^2cos^2alpha` (c)`(1/2)(a^2+b^2+(a^2-b^2)cos2alpha)` (d)`(1/2)(a^2+b^2-(a^2-b^2)cos2alpha)`

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