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已知cos(α-β)=,则(sinα+sinβ)2+(cosα+cosβ)2=
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高一下学期数学《2016级高一年级数学学科学案材料序号:453.1.1两角和与差的余弦公式》真题及答案
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已知sinα+2cosα=0则2sinαcosα-cos2α的值为.
已知sinα+2cosα=0则sin2α+cos2α=.
-sin2-cos2
-sin2+cos2
sin2+cos2
sin2-cos2
下列公式是正确的
2sin α cos β= sin( α+β) +sin( α-β)
2sin α cos β= cos( α+β) +sin( α-β) .
2sin α cos β= sin( α+β) -sin( α-β)
2sin α cos β= cos( α+β) -sin( α-β)
已知sinα+cosα=1求sin2α的值.2求sin4α+cos4α的值.
已知sinβ+cosβ=且0
已知0
已知sinα+cosα=1求sin2α的值.2求sin4α+cos4α的值.
下列公式是正确的
sin α+sin β= 2sin( 2 )cos( 2 )
sin α+sin β= 2cos( 2 )sin( 2 )
sin α+sin β= 2cos( 2 )cos( 2 )
sin α+sin β= 2cos( 2 )sin( 2 )
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已知sinα+sinβ=sin225°cosα+cosβ=cos225°求cosα-β及cosα+β
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cos α-cos β=- 2sin( 2 )sin( 2 )
cos α-cos β= 2sin( 2 )sin( 2 )
cos α-cos β= -2sin(2)sin(2)
cos α-cos β= 2sin( 2 )sin( 2 )
已知tanθ=2则sin2θ+sinθcosθ﹣2cos2θ=.
已知A.cosαsinαBcosβsinβ且|AB|=21求cosα-β的值;2设α∈0π/2β∈-
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