Member since April 10, 2012

meili

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meili
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To prove that cos(pi/5)-cos(2xpi/5)=0.5
Tue 10 Apr, 2012 01:24 am - How do we prove cos(pi/5) - cos(2 x pi/5) = 0.5 without using a calculator. Related question: how do we prove that cos(pi/5) x cos(2 x pi/5) = 0.25, also without using a calculator (view)
 
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