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cos (pi/7)* cos (2pi/7)* cos (10pi/7)- s...

`cos (pi/7)* cos (2pi/7)* cos (10pi/7)- sin (pi/14)*sin (3pi/14)*sin (5pi/14)` Find value.

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Prove that sin (pi/14)sin((3pi)/14)sin((5pi)/14)=1/8

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cos(pi/7)+cos((2pi)/7)+cos((3pi)/7)+cos((4pi)/7)+cos((5pi)/7)+cos((6pi)/7)=