How do you evaluate the expression cotpi?

1 Answer
Jim G.
Dec 17, 2016

undefined

Explanation:

Using the color(blue)"trigonometric identity"

color(orange)"Reminder " color(red)(bar(ul(|color(white)(2/2)color(black)(cottheta=(costheta)/(sintheta))color(white)(2/2)|)))

rArrcot(pi)=cos(pi)/sin(pi)=(-1)/0

"division by zero is undefined, hence " cot(pi)" is undefined"

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