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.
)sin(θ-
)=
,求tanθ的值.
+cos20°化成积的形式.
tan
+tan
tan
+tan
tan
=1.
)=
,
≤α＜
,求cos(２α+
)的值.
,sinα与sinβ是方程x2-(
cos40°)x+cos240°-
=0的两根,则cos(2α-β)=_______.
-sin
+2sin
cos
=_______________.
的最大值是_________.
且α∈(0,
),则tan
=__________.