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+# Step: standard library broadened
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+
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+Tags `v3-stdlib-broaden`. Suite **112/112** (new `Stdlib2Prog`).
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+
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+## Added
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+
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+- **`Math`** — `tan`, `arcsin`, `arccos`, `power` (bound to libm
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+ `tan`/`asin`/`acos`/`pow`; `arcsin`/`arccos`/`power` are thin
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+ wrappers so the names stay classic). Existing:
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+ `sqrt/exp/ln/sin/cos/arctan/abs`, `Pi`, `E`.
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+- **`Strings`** — `Equal` (content equality) and
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+ `Pos(pattern, s)` (1-based index of the leftmost occurrence, `0` when
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+ absent). Existing: `Length/Assign/Concat/Compare/Delete/Append/Copy`.
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+- **`CharClass`** (new) — ASCII classification: `IsDigit`, `IsUpper`,
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+ `IsLower`, `IsAlpha`, `IsSpace`.
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+
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+## Test
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+
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+`compiler/tests/stdlib2_prog.mod` (`Stdlib2Prog`, exit 42, prints
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+`stdlib2 n=42`) exercises the new `Math`/`Strings`/`CharClass` surface
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+alongside `SysIO`.
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+
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+## Note
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+
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+The directory rename to `syslib/` was **not** done (kept `stdlib/` and
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+`runtime/syslib/` as-is).
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+
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+## Files
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+
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+`stdlib/{math,strings,charclass}.def/.mod`,
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+`compiler/tests/stdlib2_prog.mod`, `compiler/run_tests.sh`.
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