Find the differential dy of the function 
Definitions:
Demand Characteristics
Cues in an experimental setting that influence participants' perceptions or behavior, potentially skewing results.
Perception of Quality
The subjective assessment of a product or service's overall excellence or desirability.
Taste Test
A method of evaluating a food item's flavor, texture, and aroma preferences among consumers.
Flavour
The distinctive taste and aroma of food or drink, stemming from its ingredients and preparation methods.
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