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prove that `cos(pi/7)-cos(2pi/7)+cos(3pi/7)=1/2` (Doubtnut) View |
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International Mathematical Olympiad problems (IMO) (EduceTube) View |
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Prove that: cos π/7. cos 2π/7. cos 3π/7 = 1/8 (Mr. Bidur Bastola) View |
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cos(π/7)cos(2π/7)cos(3π/7) = || High School Math (dumplet 餃仔) View |
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Cos(2pi/7)+Cos(4pi/7)+Cos(8pi/7) = (-1/2) (Kindhearted man) View |
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Poland international Mathematics Olympiad | prove cos(pi/7)+cos(3pi/7)+cos(5pi/7)=1/2 (Education KH) View |
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Cos (2 pi/7) Cos (4 pi/7) Cos (8 pi/7) = 1/8 @EAG (Elite Academy Guntur) View |
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The Fifth International Mathematical Olympiad Wroclaw, 1963 | Problem on Trigonometry - 2 (Mathematics Olympiad) View |
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If `z^7+1 =0` then `cos(pi/7) cos(3pi/7) cos(5pi/7)` is (Doubtnut) View |
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The exact value of cos(π/7) cos(2π/7) cos(4π/7) cos(8π/7) cos(16π/7) cos(32π/7) (Think logically!) View |