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OpenStudy (tomektomeknyc):
Which is not equal to the rest? : a) cos 0 b) sin 5 Pi/6 / cos5 Pi/3 c) cos 1 d) csc^2 (t/2) - cot ^2 (t/2)
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OpenStudy (kc_kennylau):
look at (a) and (c), must be one of them
OpenStudy (tomektomeknyc):
thank you
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