Answer to Question #10219 in Calculus for m Khan
Show your Work.
cos² x - 2cosx - 3 = 0 ==>
(cos x + 1)(cos x - 3) = 0 ==>
cos x = -1& ==> x = π (= 180°);
cos x = 3 - impossible value.
The only value for x in the interval [0,2π) is π.
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