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OpenStudy (anonymous):
If cos x cos (pi/7) + sin x sin (pi/7) =-√2/2, then x can equal: more than one answer: a. 3pi/4+pi/7+2 n pi b. 7 pi/4 + pi/7 +2 n pi c. pi/4 + pi/7 +2n pi d. 5pi/4 + pi/7 +2 n pi
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OpenStudy (anonymous):
I would say A and D
OpenStudy (anonymous):
I don't however see where 2n pi comes in.
OpenStudy (anonymous):
thank you!
OpenStudy (anonymous):
the 2n pi is for unlimited answers without restrictions
OpenStudy (anonymous):
Thank you
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