AnalieR99417 AnalieR99417

31-10-2022
Mathematics

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Which of the following expressions could be used to determine the exact value of cos 240°?

Which of the following expressions could be used to determine the exact value of cos 240 class=

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MaiteJ729730 MaiteJ729730

31-10-2022

The formula we will use is the one of cos2x:

2x=240

x=120

The formula is: cos2x = 2cos²x - 1

cos240 = 2cos²(120) - 1

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