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jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.0check your Unit Circle if you don't have one > http://i.stack.imgur.com/r8uHr.gif

thecollinjc1
 one year ago
Best ResponseYou've already chosen the best response.1cos^1 (sqrt2/2) = inverse cos (sqrt2/2) think of an angle which has a cosine equal to (sqrt2/2) cos X = (sqrt2/2) X = 45 degrees, also pi/4 surely, 45 degrees is between 90 and 180 degrees hope that helped.
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