Algebra, for calc, e.g

• Trig vis-à-vis calc, usually
• Trig, vis-à-vis calc
• Trig, for calc, often
• Trig for calc, often
• Intro to Comp Sci, for Data Structures, e.g.
• Trig, for calc, e.g

Wiktionary Word definitions in Wiktionary
n. (context informal English) prerequisite