sin15°cos^315°-cos15°sin^315°化简
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sin15°cos^315°-cos15°sin^315°化简sin15°cos^315°-cos15°sin^315°化简sin15°cos^315°-cos15°sin^315°化简原式=sin1
sin15°cos^315°-cos15°sin^315°化简
sin15°cos^315°-cos15°sin^315°化简
sin15°cos^315°-cos15°sin^315°化简
原式=sin 15° cos 15° [ (cos 15°)^2 -(sin 15°)^2 ]
=(1/2) *(2 sin 15° cos 15°) *cos 30°
=(1/2) *sin 30° *(根号3)/2
=(1/2) *(1/2) *(根号3)/2
= (根号3)/8.
= = = = = = = = =
分解因式,再用二倍角公式.
已用计算器验证.
sin15°cos^315°-cos15°sin^315°化简
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化简sin15°-cos15°/sin15°+cos15°
sin15°-cos15°/sin15°+cos15°的值?
sin15°cos15°等于
sin15°+cos15°过程
sin15°cos15°等于?
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sin15°cos15°=
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