Question

the inverse sine of sin(2pi/3) = 120degrees, correct?

Answer 1

hell no

Answer 2

trick question!

Answer 3

it is a trick to see if you are paying attention

Answer 4

LOL - whatttttt??? sin-1(sinx)=x!!!

Answer 5

OH ITS NOT IN THE DAMN RANGE

Answer 6

ooops. range of arcsine is
\[[-\frac{\pi}{2},\frac{\pi}{2}]\]

Answer 7

BALLS I SAY

Answer 8

it should be called trickonometry

Answer 9

yes. 2pi/3*180/pi
2/3*180
2*60
120

Answer 10

yah you have to find another value whose sine is also
\[\frac{2\pi}{3}\]

Answer 11

so wait - am i right or wrong with my original answer of 120?

Answer 12

wrongo

Answer 13

it is
\[\frac{\pi}{3}\]

Answer 14

oh okay - sorry. so how do i find a ....hm. range of arccosine then.....and....

Answer 15

dang it! i should have guessed...

Answer 16

\[\sin(\frac{2\pi}{3})=\frac{\sqrt{3}}{2}\] but
\[\sin^{-1}(\frac{\sqrt{3}}{2})=\frac{\pi}{3}\]

Answer 17

so is 60 degrees

Answer 18

ok think like this
for arcsine look on right half of unit circle from
\[-\frac{\pi}{2}\] to
\[\frac{\pi}{2}\]

Answer 19

f@ck degrees.

Answer 20

you are not working in degrees
you are not converting degrees to radians
forget about degrees

Answer 21

r the equation machines not working? i can't get mine up

Answer 22

viagra

Answer 23

i can't give you another medal man, but i....wood? lol

Answer 24

for arccosine look at upper half of unit circle. from 2 to pi

Answer 25

np

Answer 26

right, i just don't get how i can arbitrarily change the range i'm using for sine...

Answer 27

wood. right. i am a little slow

Answer 28

there is nothing arbitrary about it, it is fixed. ok i guess it is arbitrary but it does not change

Answer 29

and don't get the range of sine confused with the range of arcsine.

Answer 30

how can i apply the range of the arccosine to an arcsine?

Answer 31

range of arcsine is
\[[-\frac{\pi}{2},\frac{\pi}{2}]\]

Answer 32

i am sure you know what you mean by that question but i am afraid i do not

Answer 33

awwww hell. i got it. youdaman

Answer 34

the range is the range is the range. if you want arccosine of something make sure your answer is between 0 and pi
and if you want the arcsine of something your answer must be between -pi/2 andpi/2

Answer 35

trickonometry. i will remember that one