Question in trigonometry

January 4, 2008 – 6:54 pm

Jack:

If tan2x=(-24/7), find the exact value(s) of sinx and cosx Working out the answers by hand, I get sinx = ±3/5, ±4/5 cosx = ±3/5, ±4/5 But by actually calculating x and plugging it into sinx and cosx, I get sinx = 3/5, 4/5 …

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