Cos 0 = 1 why

Learn more. Asked 4 years, 3 months ago. Active 4 years, 3 months ago. Viewed 1k times. But, how do I visualize these angles on the unit circle?

Add a comment. Active Oldest Votes. Edu Edu 1, 1 1 gold badge 9 9 silver badges 23 23 bronze badges. Show 2 more comments. Crazy Crazy 2, 10 10 silver badges 25 25 bronze badges. Arthur Arthur k 14 14 gold badges silver badges bronze badges. Show 12 more comments. Active Oldest Votes.

Stefan Perko Stefan Perko We don't know its definition so we say hey let's determine the taylor series. The power series then has cosine and sine involved. Unless we know something about the values at zero, the Taylor series doesn't lose the values.

In what way do you get the taylor series? Then where did the definition of the derivative of cosine come from? No knowledge is assumed to determine they are derivatives. Let me define the term "bleeeerg". No, I won't tell you what "bleeeerg" means, but as you can "obviously" see, "bleeeerg" is green, wears pants and likes eating candy. Doesn't make sense? Of course not! Show 8 more comments.

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