第五章测试
1.If tanθ+1/tanθ=2, then sinθ+cosθ=( ).
A: B:2 C: D:
答案:A
2.If cos(α+β)=1 and sinα=1/3, then the value of sinβ is ( ).
A: B: C: D: 3.If sinα+cosα= , then the value of tanα+cotα is ( ).
A:1 B: C:-2 D:2 4.Given two acute angles α and β, if cosα=3/5, tan(α-β)=-1/3, then the value of tanβ is ( ).
A:3 B:9/13 C:1/3 D:13/9 5.If sin(x-)=3/5, then the value of sin2x is ( ).
A:16/25 B:7/25 C:9/25 D:-7/25 6.If tanα=4, then . ( )
A:对 B:错 7.For any α, β∈(0,), if tanα=(1+sinβ)/cosβ, then 2α-β=. ( )
A:对 B:错 8.If , then the value of is 2/5.( )
A:对 B:错 9.For any α∈(0,), if , then tanα=1/2. ( )
A:错 B:对 10.If f(x)=cos(/3+x)cos(/3-x)-sinxcosx+1/4, then the minimal period is . ( )
A:对 B:错

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