### (math-integrate-by-parts): Removed unused variable var-thing.

(math-integ-depth, math-integ-level, math-integral-limit) (math-enable-subst, math-any-substs, math-integ-msg) (math-prev-parts-v, math-good-parts, math-max-integral-limit) (math-int-threshold, math-int-factors, math-double-roots) (math-solve-simplifying, var-IntegLimit, math-solve-sign) (var-GenCount): Declared these variables. (calcFunc-integ): Don't check if var-IntegLimit is bound. (math-integral-cache, math-integral-cache-state): Move declarations to earlier in the file. (math-deriv-var, math-deriv-total, math-deriv-symb): New variables. (math-derivative, calcFunc-deriv, calcFunc-tderiv): Replace variables deriv-var, deriv-total and deriv-symb by declared variables math-deriv-var, math-deriv-total and math-deriv-symb. (math-cur-record): New variable. (math-integral, math-replace-integral-parts, math-integrate-by-parts) (calc-dump-integral-cache, math-try-integral): Replace variable cur-record by declared variable math-cur-record. (math-has-rules): New variable. (math-try-integral, math-do-integral): Use declared variable math-has-rules instead of has-rules. (math-t1, math-t2, math-t3): New variables. (math-do-integral, math-do-integral-methods, math-try-solve-for) (math-try-solve-prod, math-solve-poly-funny-powers) (math-solve-crunch-poly, math-decompose-poly) (math-solve-find-root-term, math-find-root-in-prod): Replace variables t1, t2, t3 by declared variables math-t1, math-t2, math-t3. (math-so-far, math-integ-expr): New variables. (math-do-integral-methods, math-integ-try-linear-substitutions) (math-integ-try-substitutions): Replace variables so-far and expr by declared variables math-so-far and math-integ-expr. (math-expr-parts): New variable. (math-expr-rational-in, math-expr-rational-in-rec): Replace variable parts by declared variable math-expr-parts. (calc-low, calc-high): New variables. (calcFunc-table, math-scan-for-limits): Replaced variable low and high with the declared variable calc-low and calc-high. (math-solve-var, math-solve-full): New variables. (math-try-solve-for, math-try-solve-prod, math-solve-prod) (math-decompose-poly, math-solve-quartic, math-poly-all-roots) (math-solve-find-root-in-prod, math-solve-for, math-solve-system) (math-solve-system-rec, math-solve-get-sign, math-solve-get-int): Replace variables solve-var and solve-full with declared variables math-solve-var and math-solve-full. (math-solve-vars): New variable. (math-solve-system, math-solve-system-rec): Replace variable solve-vars with declared variable math-solve-vars. (math-try-solve-sign): New variable. (math-try-solve-for, math-try-solve-prod): Replace variable sign by declared variable math-try-solve-sign. (math-solve-b): New variable. (math-solve-poly-funny-powers, math-decompose-poly): Replace variable b by declared variable math-solve-b. (math-solve-system-vv, math-solve-res): New variables (math-solve-system-rec, math-solve-system-subst): Replaced variables vv and res with declared variables math-solve-system-vv and math-solve-system-res.

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