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When Dct4 opened, a faint animation of points arranging themselves into a cosine curve greeted her. Version 5.4 lit in the title bar, modest and proud. The interface was retro in a way that felt honest rather than staged — blocky buttons, a pane for inputs, a pane for output coefficients, and a small, almost embarrassed button labeled "legacy view." Dct4 calculator 5.4 download
