" (7) "(2tan30^(@))/(1-tan30^(@))Arcs(pi...

" (7) "(2tan30^(@))/(1-tan30^(@))Arcs(pi)/(8)-

" (7) "(2tan30^(@))/(1-tan30^(@))Arcs(pi)/(8)-
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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 (1-sin60^(@))/(cos60^(@))=(1-tan30^(@))/(1+tan30^(@))
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Prove that: cos(pi/7)cos((2pi)/7)cos((4pi)/7)=-1/8,
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Prove that: (1+cospi/8)(1+cos(3pi)/8)(1+cos(5pi)/8)(1+cos(7pi)/8)=1/8
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Prove : tan15^@+tan30^@+tan15^@tan30^@=1
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(1 + cos ((pi) / (8))) (1 + cos (3 (pi) / (8))) (1 + cos (5 (pi) / (8)...
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Show that sin ^ (- 1) ((sin (3 pi)) / (7)) + cos ^ (- 1) ((cos (46 pi)...
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cos(cos^(-1)cos((8 pi)/(7))+tan^(-1)tan(8(pi)/(7))) has the value equa...
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