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Mathematics 7 Online
OpenStudy (carterjackson):

what are the zeroes of this function? y=2cos(2x)

OpenStudy (welshfella):

2cos 2x = 0 cos 2x = 0 what are the values of 2x? say, between 0 and 360 degrees

OpenStudy (carterjackson):

im still confused

OpenStudy (welshfella):

grab your calculator and find what angle has a cosine of 0

OpenStudy (welshfella):

use the cos-1 or arccos key

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