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Mathematics 16 Online
OpenStudy (ttop0816):

please help! Which of the following expressions is equal to cos125°? -cos55° cos55° cos(-55)° im confused whether the answer is the first one or the third one... ):

OpenStudy (anonymous):

- cos 55 because 125 is in the second quadrant and 55 is the reference angle for 125

OpenStudy (ttop0816):

oh.... okay!

OpenStudy (anonymous):

great

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