第五章单元测试
- If tanθ+1/tanθ=2, then sinθ+cosθ=( ).
- If cos(α+β)=1 and sinα=1/3, then the value of sinβ is ( ).
- If sinα+cosα= , then the value of tanα+cotα is ( ).
- Given two acute angles α and β, if cosα=3/5, tan(α-β)=-1/3, then the value of tanβ is ( ).
- If sin(x-)=3/5, then the value of sin2x is ( ).
- If tanα=4, then . ( )
- For any α, β∈(0,), if tanα=(1+sinβ)/cosβ, then 2α-β=. ( )
- If , then the value of is 2/5.( )
- For any α∈(0,), if , then tanα=1/2. ( )
- If f(x)=cos(/3+x)cos(/3-x)-sinxcosx+1/4, then the minimal period is . ( )
A: B: C:2 D:
答案:
A: B: C: D:
A:1 B:-2 C: D:2
A:9/13 B:13/9 C:1/3 D:3
A:16/25 B:-7/25 C:7/25 D:9/25
A:对 B:错
A:对 B:错
A:错 B:对
A:对 B:错
A:对 B:错
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