Just noticed, that official example works:
from sympy.parsing.sympy_parser import (parse_expr, 
standard_transformations, implicit_multiplication_application) 
parse_expr("10sin**2 x**2 + 3xyz + tan 
theta",transformations=(standard_transformations 
+(implicit_multiplication_application,)))

But 
parse_expr("10sin**(120*x) x**2 + 3xyz + tan 
theta",transformations=(standard_transformations 
+(implicit_multiplication_application,)))
raises exception (see sine exponent):

TypeError: unbound method could_extract_minus_sign() must be called with 
Symbol instance as first argument (got nothing instead)

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