In δdef, de = 11, ef = 9, and angle e = 140°. which equation correctly uses the law of cosines to solve for the third side? e2 = 112 92 - 2 (11) (9) cos (140°) 112 = e2 92 - 2e (9) cos (140°) 92 = e2 112 - 2e (11) cos (140°) e = 11 9 - 2 (11) (9) cos (140°)
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