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OpenStudy (doglover1011010101101010101101):
exact value of cos(-7pi/4 radians) a. square root of 2/2 b. 1/2 c. square root of 3/2 d. -1/2
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OpenStudy (lollylau):
You should try checking the unit circle. If you are not comfortable with negative angles add 2 pi.
OpenStudy (xguardians):
Sqrt2/2
OpenStudy (lollylau):
great.
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