The expression `cos(10pi)/13+cos(8pi)/13+cos(3pi)/13+cos(5pi)/13` is equal to

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

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

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

The value of 2"cos"(pi)/(13)"cos"(9pi)/(13)+"cos"(3pi)/(13)+"cos"(5pi)/(13) is

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