设f(sinα+cosα)=sin2α,则
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的值为
.
考点分析:
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设函数f(x)=x(
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)
x+
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,A
为坐标原点,A为函数y=f(x)图象上横坐标为n(n∈N
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=
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,向量
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与向量
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tanθ
k<
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