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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... ):
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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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