cos^(-1)(cos( pi/7))...

`cos^(-1)(cos( pi/7))`

cos^(-1)(cos( pi/7))
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If z^(7)+1=0 then cos((pi)/(7))cos((3 pi)/(7))cos((5 pi)/(7)) is (A)(1...
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prove that cos(pi/7)-cos(2pi/7)+cos(3pi/7)=1/2
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cos^(-1)(cos((7 pi)/(6))) is equal to
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Prove that: cos(pi/7)cos((2pi)/7)cos((4pi)/7)=-1/8,
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The value of cos(pi/7)+cos((2pi)/7)+cos((3pi)/7)+cos((4pi)/7)+cos((5pi...
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(1 + cos ((pi) / (8))) (1 + cos (3 (pi) / (8))) (1 + cos (5 (pi) / (8)...
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The value of (1+cos (pi/6))(1+cos(pi/3))(1+cos ((2pi)/3))(1+cos((7pi...
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cos^(-1)((cos(7 pi))/(5)) is equal to
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