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,sinβ
,求α+2β的值.
）=
,cos2α=
,求sinα及tan(α+
).
,AC=2,AB=3,求tanA的值和△ABC的面积.
.
.
-x)=
,x∈(0,
),则
=______________.
］内有两个不同的实数值，满足等式cos2x+
sin2x=k+1,则k的范围是________.