Question

cos^-1 sqrt 2/2 exact value

Answer 1

It is read as follows:

The angle whose cosine is sqrt(2)/2

Answer 2

what theta give you root(2)/2?

Answer 3

π/4 or 45˚

Answer 4

there will be two in 0 to 2pi

Answer 5

and -pi/4

Answer 6

In general, 2πn ± π/4

Answer 7

Where n is integer

Answer 8

Keep in mind that arccos (or cos inverse) is defined only from 0 to pi

Arcsin and Arctan are defined from -pi/2 to pi/2

Answer 9

so pi/4 is your only answer

Answer 10

Oh ya... Thx

Answer 11

http://openstudy.com/study#/updates/509f15ffe4b013fc35a1955a

Answer 12

lol strange

Answer 13

Oh, give him some credit. It's his first question. Probably trying to figure out where to post. Keep on keepin' on!

Answer 14

But if the question is cos x = sqrt(2)/2 then the answer is 2πn±π/4 right?

Answer 15

Kira, that might be the case. I try not to recall those fancy formulas. Instead, I learn the fundamentals, such as where inverse trig functions are defined.

That will be invaluable--it has for me up through Cal 2.

Answer 16

Ok thx