The cosine function can be graphed in the same coordinate system as sine, and it has the same wave shape as sine but is offset (phase-shifted) by 90° (or π/2 radians), because the adjacent side is geometrically offset by 90° from the opposite side.
factualpending
Evidence Quote
“the cosine looks exactly like the sign. It's just shifted by 90° or half of pi.”
Created: 8/12/2026, 6:18:22 PM
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