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find the resultant of two forces e...

find the resultant of two forces each having magnitude ` F_0` and angle between them is ` theta `.

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`F_("Resultant")^2 = F_(0)^(2) +F_(0)^(2) + 2F_(0)^(2) cos theta = 2 F_(0)^(2) (1 + cos theta ) = 2 F_(0)^(2) ( 1+ 2 cos^2 "" theta/2 -1) =2 F_(0)^(2) xx 2 cos ^(2) theta/2 F_("Resultant ")=2 F_(0) cos theta/2`
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