code: def get_case(d, t):
      """
      Returns the type of the derivation d.
  
      Returns one of {'exp', 'tan', 'base', 'primitive', 'other_linear',
      'other_nonlinear'}.
      """
      if not d.expr.has(t):
          if d.is_one:
              return "base"
          return "primitive"
      if d.rem(Poly(t, t)).is_zero:
          return "exp"
      if d.rem(Poly(1 + t**2, t)).is_zero:
          return "tan"
      if d.degree(t) > 1:
          return "other_nonlinear"
      return "other_linear"
  
imports: from types import GeneratorType
  from functools import reduce
  from sympy.core.function import Lambda
  from sympy.core.mul import Mul
  from sympy.core.intfunc import ilcm
  from sympy.core.numbers import I, oo
  from sympy.core.power import Pow
  from sympy.core.relational import Ne
  from sympy.core.singleton import S
  from sympy.core.sorting import ordered, default_sort_key
  from sympy.core.symbol import Dummy, Symbol
  from sympy.functions.elementary.exponential import log, exp
  from sympy.functions.elementary.hyperbolic import cosh, coth, sinh, tanh
  from sympy.functions.elementary.piecewise import Piecewise
  from sympy.functions.elementary.trigonometric import atan, sin, cos, tan, acot, cot, asin, acos
  from .integrals import integrate, Integral
  from .heurisch import _symbols
  from sympy.polys.polyerrors import DomainError, PolynomialError
  from sympy.polys.polytools import real_roots, cancel, Poly, gcd, reduced
  from sympy.polys.rootoftools import RootSum
  from sympy.utilities.iterables import numbered_symbols
label_desc: Use image node_id 7 for calling a global function with example usage: get_case(d, t) and returns: str, str, str, str, str, str