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关于函数y=sinxcos(2π-2x)-sin(
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+x)sin(π+2x)的最小正周期和奇偶性,下列叙述正确的是( )
A.周期为2π的奇函数
B.周期为2π的偶函数
C.周期为
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的奇函数
D.周期为
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的偶函数
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设a=
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cos6°-
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,b=
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,
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则有( )
A.a<b<c
B.a<c<b
C.a>b>c
D.a>c>b
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把函数y=cosx的图象上所有的点的横坐标缩小到原来的一半,纵坐标保持不变,然后把图象向左平移
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个单位长度,得到新的函数图象,那么这个新函数的解析式为( )
A.
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B.
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C.
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D.
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若
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,则式子
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可化简为( )
A.
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B.-2sin
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C.2cos
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D.-2cos
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已知8sinα+5cosβ=6,8cosα+5sinβ=10,则sin(α+β)的值是( )
A.
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B.
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C.-
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D.±
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