what's the answer to this problem? http://mathbits.com/Caching/T30050.html?

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kailasanathan_808

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2. cot(7pi/4) = cot(pi-7pi/4) = cot(8pi-7pi/4) = cot(pi/4) = 1.
3.costheta = 3/5
sin(squared theta) = 1 - cos(squared theta)
= 1 - 9/25
= 16/25
hence.. sin theta = 4/5
 
plss help wth this problem it's really hard for me here's the link http://mathbits.com/Caching/T30050.html
 
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