Please help! Given: sinA=-3/5, cosB=15/17, angle A in Quadrant III and angle B in Quadrant I. cos2B= a. -64/289 b. 161/289 c. 225/289 d. 240/289

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Please help! Given: sinA=-3/5, cosB=15/17, angle A in Quadrant III and angle B in Quadrant I. cos2B= a. -64/289 b. 161/289 c. 225/289 d. 240/289

Mathematics
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eh...did you do wat I told you to do last time? def help you much
I tried it but for some reason this problem is harder than the last :/ I'll ask around
is your calc in deg or rad?

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Other answers:

Degree
that MIGHT be it...im not sure
Would you be able to go through the problem with me step by step or should I just keep asking for help? It's fine if you can't :)
eh...im no good at math.
but, YOU DID find that circle pi chart right?
Yup, thanks
well...sorry i couldn't help much. but good luck eh

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