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OpenStudy (anonymous):
cos 175 degrees cos 55 degrees + sin 175 degrees sin 55 degrees
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OpenStudy (raden):
hint : cos(a)cos(b) + sin(a)sin(b) = cos(a - b)
OpenStudy (dumbcow):
to find cos(a-b) use unit circle http://en.wikipedia.org/wiki/File:Unit_circle_angles_color.svg
OpenStudy (anonymous):
Thanks!
OpenStudy (dumbcow):
yw :)
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