cosπ/12*cos5π/12结果是1/4
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cosπ/12*cos5π/12结果是1/4cosπ/12*cos5π/12结果是1/4cosπ/12*cos5π/12结果是1/4cosπ/12*cos5π/12=cos5π/12*cosπ/12=
cosπ/12*cos5π/12结果是1/4
cosπ/12*cos5π/12
结果是1/4
cosπ/12*cos5π/12结果是1/4
cosπ/12*cos5π/12
=cos5π/12*cosπ/12
=1/2 * [cos(5π/12+π/12)+cos(5π/12-π/12)
=1/2 * [cosπ/2+cosπ/3]
=1/2 * [0+1/2]
=1/2 * 1/2
=1/4
用的是积化和差公式,属于高中要求范围的
cosπ/12*cos5π/12结果是1/4
cos5/12πcosπ/12+cosπ/12sinπ/6=?
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
2倍角公式求值》cosπ/12 x cos5π/12
求值cos5π/8*cosπ8
sinπ/12cos5π/12等于
求cos5π/12sinπ/12
(sina5π/12+cos5π/12)(sin5π/12-cos5π/12)
cos平方5π/12+cos平方π/12+cos5π/12cosπ/12的值等于多少（要过程）
cos方5π/12+cos方π/12+cosπ/12*cos5π/12 最后等于5/4的过程.
cos方5π/12+cos方π/12+cosπ/12*cos5π/12 最后等于4/5的过程.
帮我解,证明恒等式（cos平方5π/12）+（cos平方π/12）+（cos5π/12）（cosπ/12）=5/4
求值:cos5π/8cosπ/8=
求值cos5π/8cosπ/8解cos5π/8cosπ/8,请写出过程.
cos5分之π×cos5分之2π
为什么cos5π/12等于sinπ/12
cos5π/12=sinπ/12 怎么算的?