第五章单元测试
  1. If tanθ+1/tanθ=2, then sinθ+cosθ=( ).

  2. A: B: C:2 D:
    答案:
  3. If cos(α+β)=1 and sinα=1/3, then the value of sinβ is ( ).

  4. A: B: C: D:
  5. If sinα+cosα= , then the value of tanα+cotα is ( ).

  6. A:1 B:-2 C: D:2
  7. Given two acute angles α and β, if cosα=3/5, tan(α-β)=-1/3, then the value of tanβ is ( ).

  8. A:9/13 B:13/9 C:1/3 D:3
  9. If sin(x-)=3/5, then the value of sin2x is ( ).

  10. A:16/25 B:-7/25 C:7/25 D:9/25
  11. If tanα=4, then . ( )

  12. A:对 B:错
  13. For any α, β∈(0,), if tanα=(1+sinβ)/cosβ, then 2α-β=. ( )

  14. A:对 B:错
  15. If , then the value of is 2/5.( )

  16. A:错 B:对
  17. For any α∈(0,), if , then tanα=1/2. ( )

  18. A:对 B:错
  19. If f(x)=cos(/3+x)cos(/3-x)-sinxcosx+1/4, then the minimal period is . ( )

  20. A:对 B:错

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