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86) cos 2x = 2 A) 0, 2, , 4T 3 ' 9 15 8 8 5 B) 7 3 5T 7T 4' 4'4
86) cos 2x = 2 A) 0, 2, , 4T 3 ' 9 15 8 8 5 B) 7 3 5T 7T 4' 4'4 D) no solution 87) sin 2x = 1 A) 0, 2, 3 C) THE 19TH 8 L, 4 3 88) cos 2x = 2 - cos 2x 2 A) 0, 2T, , , T 3 7 9 15 , 8' 8 8 8 3 5 7 4 4'4 B) 7, 3 5T D) no solution 3 5 7 4' 4' 4 B) 7, 3 5T D) no solution 89) sin 2x + sin x = 0 A) 188 9 3 5 7 4'4'4 B) 0, 2, , 3 D) no solution Use a calculator to solve the equation on the interval [0, 2). Round the answer to two decimal places. 90) cos x = 0.74 A) 0.74, 2.31 B) 0.74, 5.55 C) 0.74, 3.88 D) 0.74, 2.40
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