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This function converts text to lower case letters.
LOWER(string)
[Required] The argument is the text you want to convert to lower case. This function does not change characters in value that are not letters. The argument may be a string, a reference to a cell containing a string, or a formula that returns a string.
LOWER(A4)
LOWER(R4C1)
LOWER("Road Race 2") gives the result road race 2
LOWER(CONCATENATE(A1,A5))