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The greatest & the least magnitude of th...

The greatest & the least magnitude of the resultant of two forces of constant magnitudes are P & Q respectively. If the forces act at an angle `2 alpha`, then prove that the magnitude of their resultant is given by `sqrt(P^(2) cos^(2) alpha+Q^(2) sin^(2) alpha)`.

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`2F cos"" (alpha )/( 2)`
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