solve each equation for principal values of x. Express solutions in degrees. cos²(x) = cosx?
回答 (3)
2016-05-06 4:21 am
Basically, when Cos(x)= 1 or 0, so 0, 90, 270, and 360.
2016-05-06 3:53 am
cosx can be 0 or 1...
2016-05-06 3:53 am
obviously 0° and 90°
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