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Which of the following equations represents the resultant vector of two forces F_1 and F_2 acting at an angle $\theta$ \theta apart starting from the same origin? i.e. calculate F1 + F2. Refer to the image below for an illustration. Remember that when adding vectors, the tail of one vector needs to connect to the head of another.

$\sqrt{{F_1}^2+{F_2}^2 -2{F_1}{F_2} \cos (\theta)}$ \sqrt{{F_1}^2+{F_2}^2 -2{F_1}{F_2} \cos (\theta)}

${F_1}^2+{F_2}^2 -2{F_1}{F_2} \cos (\theta)$ {F_1}^2+{F_2}^2 -2{F_1}{F_2} \cos (\theta)

$\sqrt{{F_1}^2\cos(\theta)+{F_2}^2\cos(\theta)}$ \sqrt{{F_1}^2\cos(\theta)+{F_2}^2\cos(\theta)}

$\sqrt{{F_1}^2+{F_2}^2 +2{F_1}{F_2} \cos (\theta)}$ \sqrt{{F_1}^2+{F_2}^2 +2{F_1}{F_2} \cos (\theta)}

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