Find the exact value of; cos 7pie/4

cos 7pie/4
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???????? kosine(7*pi/4) ?????...that impli the angel must be RADIANS

??????????? exakt ???????

pi=180 deg, so (7/4)*180=315 deg

same as -45 deg

kosine(-45deg)=kosine(+45)=sqrt(2)/2

=0.7071067811865476...
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