1)sin5π/12sinπ/12的值是2)sin315°sin(-1260°)+cos570°sin(-840°)=?3)已知sin(π/2+a)=-4/5,a∈(π,3π/2),则cos(π/3-a)的值为?
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(sin5π/12-sinπ/12)(sin5π/12+sinπ/12)的值 急!
计算:sinπ/12 sin5π/12
1)sin5π/12sinπ/12的值是2)sin315°sin(-1260°)+cos570°sin(-840°)=?3)已知sin(π/2+a)=-4/5,a∈(π,3π/2),则cos(π/3-a)的值为?
计算sinπ/12*sin5π/12我没有分了,知道的人就帮帮忙,
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(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
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(sin10π/11*sin8π/11*sin6π/11)/(sinπ/11*sin3π/11*sin5π/11)*1/2^5=1/2^5,这是怎样求得的?
高一数学解答 !急!三角函数sin25π/12·cos11π/6-cos11π/12·sin5π/6 的值是A -√2/2 B √2/2 C -sinπ/12 D sinπ/12 详细解答!求