In this article, I give a rigorous proof of the period of cosine functions, using an a fortiori argument, signaled by the use of the words “in particular”. When something is generally true
for, say, all real numbers, it is “all the more” true for a particular
case of a real number like zero. I use this logic to nail down the answer.
Question
Solution
Suitable Levels
* revision for IB Mathematics HL / SL
*
other syllabuses that teach trigonometry
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