Recommended Questions
- prove that cos2pi/7 + cos4pi/7 + cos6pi/7 = -1/2
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- prove that cos(pi/7)-cos(2pi/7)+cos(3pi/7)=1/2
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- Prove that: cos(pi/7)cos((2pi)/7)cos((4pi)/7)=-1/8,
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- Prove that 4cos(2pi)/7dotcospi/7-1=2cos(2pi)/7dot
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- prove that cos2(pi)/(7)+cos4(pi)/(7)+cos6(pi)/(7)=-(1)/(2)
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- 7^(x+2)-1/7*7^(x+1)-14*7^(x-1)+2*7^x=48
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- Prove that : cos(pi/7)cos((2pi)/7) cos((3pi)/7)=1/8
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- prove that 4(cos(2 pi))/(7)*(cos pi)/(7)-1=2(cos(2 pi))/(7)
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- Prove that log(7) log(7)sqrt(7sqrt((7sqrt7))) = 1-3 log(7) 2.
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