साबित करें कि (Prove that) cos.(pi)/(5)+...

साबित करें कि (Prove that) `cos.(pi)/(5)+cos.(2pi)/(5)+cos.(7 pi)/(5)=0`.

साबित करें कि (Prove that) cos.(pi)/(5)+cos.(2pi)/(5)+cos.(7 pi)/(5)=0...
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prove that cos[(pi)/(5)]-cos[(2 pi)/(5)]=(1)/(2)
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The value of cos[1/2cos^(-1)cos((14pi)/5)]i s (a)cos((2pi)/5) ...
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(cos pi) / (5) + (cos (2 pi)) / (5) + (cos (6 pi)) / (5) + (cos (7 pi)...
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Prove that: cos(pi/5)cos((2pi)/5)cos((4pi)/5)cos((8pi)/5)=(-1)/16
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The value of cos[1/2cos^(-1)(cos(-(14pi)/5))]\ is/are a.cos(-(7pi)/...
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Prove that : int(0)^(pi//2) (cos^(5))/(sin^(5) x+cos^(5) x)dx= (pi)/(4...
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सिध्द कीजिये कि : cos .(pi)/(5) cos .(2pi)/(5) cos (3pi)/(5)cos .(4...
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Prove that cos((pi)/(8))+cos((3 pi)/(8))+cos((5 pi)/(8))+cos((7 pi)/(8...
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