King property (a+b−x) (∫_a^b f(x)dx = ∫_a^b f(a+b−x)dx)

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∫_a^b f(x)dx = ∫_a^b f(a+b−x)dx

What each symbol means

Symbol	What it stands for
a,b	Limits of integration

Substitution u = a+b−x swaps bounds back.