bsneed01 bsneed01

24-04-2018
Mathematics

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what is the first step to solve this equation 4cos(x)=1+2cos(x)?

what is the first step to solve this equation 4cosx12cosx class=

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mkryukova19 mkryukova19

24-04-2018

4cos(x)-2cos(x)=1+2cos(x)-2cos(x)
2cos(x)=1
cos(x)=1/2 (Positive cos are only in the first and 4th quadrants.)
x=π/3,
x=2π - π/3 = 5π/3

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