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A right triangle has perimeter of length 7 and hypotenuse of length `3.` If `theta` is the larger non-right angle in the triangle, then the value of `costhetae q u a ldot` `(sqrt(6)-sqrt(2))/4` (b) `(4+sqrt(2))/6` `(4-sqrt(2))/3` (d) `(4-sqrt(2))/6`

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