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= cos45 * cosx + sin45 * sinx - (cos45 * cosx - sin45 * sinx) =
= √2/2 * cosx + √2/2 * sinx - √2/2 * cosx + √2/2 * sinx =
= √2 * sinx
-1 ≤ sinx ≤ 1
-√2 ≤ √2 * sinx ≤ √2
odp: zb.wart: y∈<-√2; √2>