证明：
sin(π/4+x)/sin(π/4-x)+cos(π/4+x)/(π/4-x) ?
最后少了一个三角函数符号,请核对题目后追问.
求证:sin(π/4+x)/sin(π/4-x)+cos(π/4+x)/(π/4-x)=2/cos2x
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