- #1
glass.shards
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If tan2x=(-24/7), find the exact value(s) of sinx and cosxWorking out the answers by hand, I get
sinx = ±3/5, ±4/5
cosx = ±3/5, ±4/5But by actually calculating x and plugging it into sinx and cosx, I get
sinx = 3/5, 4/5
cosx = 3/5, -4/5I'm pretty sure that the latter are the answers, but how do I justify it given the ±?
sinx = ±3/5, ±4/5
cosx = ±3/5, ±4/5But by actually calculating x and plugging it into sinx and cosx, I get
sinx = 3/5, 4/5
cosx = 3/5, -4/5I'm pretty sure that the latter are the answers, but how do I justify it given the ±?