求值:cos(25π /4)
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求值:cos(25π /4)
求值:cos(25π /4)
求值:cos(25π /4)
=cos(π/4)=根号2/2
cos(25π/4)=cos(π/4)=二分之根号二
cos((6+1/4)π)
=cos(6π+π/4)
=cos(π/4)
=2分之根号2
√ 2比2
cos (25pi /4) = cos (pi / 4)=根号2除以2
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