ErickP8586
04.08.2019 •
Mathematics
Find all values of x in the interval [0, 2π] that satisfy the equation. (enter your answers as a comma-separated list.) 18 + 9 cos(2x) = 27 cos(x)
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Ответ:
18 + 9(2 cos^2 x - 1) = 27 cos x
18cos^2 x - 27 cos x + 9 = 0
2 cos^ x - 3 cos x + 1 = 0
(2 cos x - 1 )(cos x - 1 ) = 0
cos x = 1/2 , 1
x = pi/3, 5pi/3, 0, 2pi answer
Ответ:
Answer : 7x - 1
Step-by-step explanation:
5x + 2x - 2 + 1 = 7x - 1