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kekeman:
Which of the following expressions could not be used to determine the exact value of cos 120°? cos2(60°) − sin2(60°) 2cos2(60°) − 1 2sin(60°)cos(60°) 1 − 2sin2(60°)
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jhonyy9:
try it in this way 120 = 60 + 60 cos 120° = cos (60+60) = ? use formula cos (a+b)= ?
kekeman:
@jhonyy9 wrote:
try it in this way
120 = 60 + 60
cos 120° = cos (60+60) = ?
use formula cos (a+b)= ?
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