How do you express $cos pi/3$ as a cofunction of a complementary angle?

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Answer 1 · 2015-02-17T18:24:02

I suppose you wanted to write: $cos(pi/3)$ .

It is useful to remember that: $cosalpha=sin(pi/2-alpha)$ .

So:

$cos(pi/3))=sin(pi/2-pi/3)=sin(pi/6)$ .

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How do you express cos pi/3cos pi/3 as a cofunction of a complementary angle?