急:求sin π/12×cos π/12的值这是我的解题步骤:1/2×2(sin π/6*cos π/6)=1/2*sin π/6=1/2×1/2=1/4但我和标准答案对照过了,得数是对的,就是感觉过程有点别扭,感觉不对,
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急:求sin π/12×cos π/12的值这是我的解题步骤:1/2×2(sin π/6*cos π/6)=1/2*sin π/6=1/2×1/2=1/4但我和标准答案对照过了,得数是对的,就是感觉过程有点别扭,感觉不对,
急:求sin π/12×cos π/12的值
这是我的解题步骤:
1/2×2(sin π/6*cos π/6)=1/2*sin π/6=1/2×1/2=1/4
但我和标准答案对照过了,得数是对的,就是感觉过程有点别扭,感觉不对,
急:求sin π/12×cos π/12的值这是我的解题步骤:1/2×2(sin π/6*cos π/6)=1/2*sin π/6=1/2×1/2=1/4但我和标准答案对照过了,得数是对的,就是感觉过程有点别扭,感觉不对,
不对
sin π/12×cos π/12
=1/2×sin( π/12*2))
=1/2*sin π/6
=1/2×1/2
=1/4
求sin π/12-(根号3)cos π/12
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(sinπ/24)(cosπ/24)(cosπ/12)
(sinπ/24)(cosπ/24)(cosπ/12)
sinπ/12*cosπ/12=?
求值:sin(π/12)+cos(π/12)
sin(π/12)-cos(π/12)=
cos*π/12—sin*π/12
cosπ/12乘以sinπ/12
计算cosπ/12*sinπ/12
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(cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为
(cosπ/12 -sinπ/12)(cosπ/12 +sinπ/12)=
(sinπ/12+cosπ/12)(sinπ/12-cosπ/12)=
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