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In any parallelogram if a and b are the ...

In any parallelogram if `a and b` are the length of the two non-parallel sides, `theta` is the angle measure between these two sides and `d` is the length of the diagonal that has a common vertex with sides `a and b`, then show that the measure of `d` can be given be : `d^2 = a^2 + b^2 + 2ab cosx`

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