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Prove that cos 2 pi/ 7 cos 4 pi/7 cos 8 pi/7 = 1/8
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Prove that cos 2 pi/ 7 cos 4 pi/7 cos 8 pi/7 = 1/8
#eamcet #bitsat #darsi #intermediate #intermediatemaths #markapur #maths #mpc #ncertmaths #trigonometry
#eamcet #bitsat #darsi #intermediate #intermediatemaths #markapur #maths #mpc #ncertmaths #trigonometry