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" (1) "(1278)/(2(08(1)/(13)times08(91)/(...

" (1) "(1278)/(2(08(1)/(13)times08(91)/(13))(08(31)/(13)+cos(54)/(13))*0)

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Find (-7)/(13) - ((-5)/(91))

The expression (cos(10 pi))/(13)+(cos(8 pi))/(13)+(cos(3 pi))/(13)+(cos(5 pi))/(13)

(-5)/(13)+?=-1 8/(13) (b) (-8)/(13) (-18)/(13) (d) (18)/(13)

Prove that 2 cos""(pi)/(13)cos""(9pi)/(13)+cos""(3pi)/(13)+cos""(5pi)/(13)=0

2cos(pi/13)cos(9pi/13)+cos(3pi/13)+cos(5pi/13)=0

Prove that : 2cos""(pi)/(13)cos""(9pi)/(13)+cos""(3pi)/(13)+cos""(5pi)/(13)=0

Solve : 4/(13)+2/(13)+1/(13)

Solve : 4/(13)+2/(13)+1/(13)