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y=2sin(π/4-x)
y=-2sin(x-π/4)
函数y=2sin(x-π/4) 的单调递增区间
2kπ-π/2<=x-π/4<=2kπ+π/2 2kπ-π/4<=x<=2kπ+3π/4
即 函数y=2sin(x-π/4) 的单调递增区间为【2kπ-π/4,2kπ+3π/4】
所以y=2sin(π/4-x)的单调递减区间为【2kπ-π/4,2kπ+3π/4】
函数y=2sin(x-π/4) 的单调递减区间
2kπ+π/2<=x-π/4<=2kπ+3π/2 2kπ+3π/4<=x<=2kπ+7π/4
即 函数y=2sin(x-π/4) 的单调递减区间为【2kπ+3π/4,2kπ+7π/4】
所以y=2sin(π/4-x)的单调递增区间为【2kπ+3π/4,2kπ+7π/4】 k∈Z
y=-2sin(x-π/4)
函数y=2sin(x-π/4) 的单调递增区间
2kπ-π/2<=x-π/4<=2kπ+π/2 2kπ-π/4<=x<=2kπ+3π/4
即 函数y=2sin(x-π/4) 的单调递增区间为【2kπ-π/4,2kπ+3π/4】
所以y=2sin(π/4-x)的单调递减区间为【2kπ-π/4,2kπ+3π/4】
函数y=2sin(x-π/4) 的单调递减区间
2kπ+π/2<=x-π/4<=2kπ+3π/2 2kπ+3π/4<=x<=2kπ+7π/4
即 函数y=2sin(x-π/4) 的单调递减区间为【2kπ+3π/4,2kπ+7π/4】
所以y=2sin(π/4-x)的单调递增区间为【2kπ+3π/4,2kπ+7π/4】 k∈Z
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