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[" (1) "cos306^(@)+cos234^(@)+cos162^(@)...

[" (1) "cos306^(@)+cos234^(@)+cos162^(@)+],[cos18^(@)=0]

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Prove that cos306^(@) + cos234^(@) + cos162^(@) + cos18^(@) = 0

Prove: (iv) cos 306^(@) + cos 234^(@) + cos 162^(@) + cos 18^(@) = 0 .

What is the value of cos306^(@)+cos234^(@)+cos162^(@)+cos18^(@) ?

cos42^(@)+cos78^(@)+cos162^(@)=

cos130^(@)+cos110^(@)+cos10^(@)=0

cos130^(@)+cos110^(@)+cos10^(@)=0

cos 20^(@) + cos 100^(@) + cos 140^(@) = 0

Prove that cos 2 0^(@)cos4 0^(@)cos6 0^(@)cos8 0^(@)=1/16

cos18 ^ (@) - sin18 ^ (@) =

cos1^(0)+cos2^(0)+cos3^(0)+ . . .+cos180^(0) =