Solve the equation on the interval [ 0 , 2 π ] cos ⁡ 2...

Ibrahim Rosales

Ibrahim Rosales

Answered

2022-07-25

Solve the equation on the interval [ 0 , 2 π ]
cos 2 x = 2 cos 2 x

Answer & Explanation

abortargy

abortargy

Expert

2022-07-26Added 19 answers

cos 2 x = 2 cos 2 x
2 cos 2 x = 2
cos 2 x = 2 2
cos 2 x = 1 2
2 x = cos 1 ( 1 2 )
2 x = π 4   o r   7 π 4
x = π 8   o r   7 π 8

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