For curves and lines, subtract the lower function from the upper one after finding their intersection points. But I always sketch it first; sometimes the "upper" function swaps if you're not careful, like that *bakwaas* problem last year where I lost 4 marks. My life lesson is from my father's old, patched quilt—you must see the whole layout before you cut, or you'll ruin the cloth. So, the rule is simple, but applying it needs a tailor's eye for the full picture.
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