$$\int_0^T\int_{-x}^{T-x} f(y) dy dx = \int_{-T}^T (T-|y|)f(y) dy$$
I'm so confused, but I can't reach from one side of equality to the other, please help me.
2026-03-29 10:12:07.1774779127
Why are these two integrals equal?
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