Question

Is there any way to do Cosi without calculator?

Answer 1

Yes. It depends on the specific question whether or not you can do it without a calculator

Answer 2

You can use a protactor.

Answer 3

So I guess the answer is "sometimes".

Answer 4

lets say it is just Cosi

Answer 5

Cos of what? I can do cos(45 degrees) without a calculator, but not cos (46) or cos(47)

Answer 6

Cos of i

Answer 7

Do you know what imaginary number is?

Answer 8

oh, ok.
cos(i) is undefined. I have never hears of anyone finding the cos of an imaginary number. It makes no sense geometrically.

Answer 9

Why? Can you explain why is it undefined?

Answer 10

Cos is a function that is applied to angles. If youre finding the cos of i, there would theoretically need to be an angle of size i. There is no angle in 2-dimensional space whose measure is the square root of -1. i is the square root of -1. How would you draw an angle of size i? You can't.

Answer 11

Oh, K! I think I get that!

Answer 12

What about log of i

Answer 13

log base 10, of course

Answer 14

log(i) is the number we need to raise 10 by to get i. There is no number that we can raise 10 to and get i. In fact, 10^x is a positive real number for every possible number we can plug in for x.

Answer 15

YEah, I plugged this into calc, and it was https://www.google.com/search?q=log+in+facebook&aq=0&oq=log+i&aqs=chrome.0.0j57j0j60l5j0j62.1209&sourceid=chrome&ie=UTF-8#psj=1&q=logi

Answer 16

TNX!