求值cos5π/8cosπ/8解cos5π/8cosπ/8,请写出过程.
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求值cos5π/8cosπ/8解cos5π/8cosπ/8,请写出过程.求值cos5π/8cosπ/8解cos5π/8cosπ/8,请写出过程.求值cos5π/8cosπ/8解cos5π/8cosπ/
求值cos5π/8cosπ/8解cos5π/8cosπ/8,请写出过程.
求值cos5π/8cosπ/8
解cos5π/8cosπ/8,请写出过程.
求值cos5π/8cosπ/8解cos5π/8cosπ/8,请写出过程.
cos(5π/8+π/8)=cos5π/8cosπ/8-sin5π/8sinπ/8=-√2/2
cos(5π/8-π/8)=cos5π/8cosπ/8+sin5π/8sinπ/8=0
两式相加2cos5π/8cosπ/8=-√2/2
cos5π/8cosπ/8=-√2/4
cos5π/8cosπ/8
=[cos(5π/8+π/8)+cos(5π/8-π/8)]/2
=(cos3π/4+cosπ/2)/2
=(cos3π/4)/2
=-√2/4
求值cos5π/8*cosπ8
求值cos5π/8cosπ/8解cos5π/8cosπ/8,请写出过程.
求值:cos5π/8cosπ/8=
sinπ/8*cos5π/8
cos5分之π×cos5分之2π
2倍角公式求值》cosπ/12 x cos5π/12
计算cos5分之π+cos5分之2π+cos5分之3π+cos5分之4π
cos5π等于=
计算cos5分之π+cos5分之2π+cos5分之3π+cos5分之4π
求值：(cosπ/8）^4+（cos3π/8）^4+(cos5π/8)^4+（cos7π/8）^4=正确答案是3/2,我想知道解题过程,自己解了很多遍都不对!谢谢!
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