1.化简:(1)
sin(180)sin()tan(360);
tan(180)cos()cos(180)2、下列各式不正确的是 ( )
A. sin(α+180°)=-sinα B.cos(-α+β)=-cos(α-β) C. sin(-α-360°)=-sinα D.cos(-α-β)=cos(α+β) 3、若sin(π+α)+sin(-α)=-m,则sin(3π+α)+2sin(2π-α)等于( ) 2323
A.- m B.- m C. m D. m
32324、sin19的值等于( )
6A.
1 2B. 1 2 C.
3 2
D. 3 2cos40505.tan300°+
sin4050A.1+6.sin
的值是( )
3
B.1-
3
C.-1-
3
D.-1+
3
4255·cos·tan的值是 364333A.- B. C.-
444 D.
3 4( )
7.设tan1234a,那么sin(206)cos(206)的值为
B.-
A.
1a1a21a1a2 C.
a11a2 D.
1a1a2
8.已知 tan()3, 求
232cos(a)3sin(a)的值
4cos(a)sin(2a)sin(2)sin(3)cos(3)cos()cos()cos(4)的值
9.若cos α=,α是第四象限角,求
A.
1 2B. 1 2 C.
3 2
D. 3 2则
10.已知函数
( ) A.5
f(x)asinxbtanx1,满足
f(5)7.f(5)的值为
B.-5
,则sin(C.6 D.-6
3tan,11.已知,
42)
- 1 -
A.33 B.
55 C.454 D.
5
12.已知sin51,那么cos( ) 25
A.2112 B. C. D.555513.若cos(2)53且(2,0),则sin()
A.5212 B. C. D. 333314.cos(2014)的值为( ) 3133 C. D. 2222)1,则cos(x) . 2= .
A.
12 B.15.如果sin(x16.如果cosα=
,且α是第四象限的角,那么
5)25217.已知sin,求tan()的值.
55cos()2sin(18.已知为第三象限角,
3sin()cos()tan()22f. tan()sin()(1)化简
f;
31),求f的值. 25.
(2)若cos(19.化简
sin()cos(4)1,求cos()的值.
cos224321.已知角的终边经过点P (, ),
5520.已知
(1)求cos的值;
sin()tan()2(2)、求的值.
sin()cos(3) - 2 -
3
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