Question

when finding the positive acute angle of an angle that lies in quadrant 3, do you subtract thetha from 180?

Answer 1

*180 from thetha

Answer 2

Em I am not really sure about this one can you help

Answer 3

can i give you the problem

Answer 4

sure thing

Answer 5

cos 230 as a positive acute angle?

Answer 6

i think its actually - cos50 but idk how to do the work

Answer 7

I dont remember well but there was a principle cos(-a) = cos(a)

Answer 8

erm
...
the angle 230 makes with the x axis
would be 50 degrees
because 230-180 = 50
then the "All Students Take Calculus" thing
https://en.wikipedia.org/wiki/All_Students_Take_Calculus
so you know cos is negative in Quadrant 3

Answer 9

so yeah naruto is right :)

Answer 10

omg Em you are intelligent ^_^

Answer 11

LOL thanks xDD!! but urmm idk how to do tan(-45) ):

Answer 12

tan(-45) = tan(360-45) = tan(315)

and 315 is just 45 under the x axis (quadrant 4)
tan is negative in Q4 so so -tan(45) ....

which can be figured out with a 45 45 90 triangle

Answer 13

wait.... i don't get it.....

Answer 14

i cant even figure out the answer.. isnt it supposed to be acute?

Answer 15

sorry >.< annas asked me to help, but I'm just a bit tired XD
so tan(45) = 1
tan(-45) is in quadrant 4
so tan(-45) = -1

Answer 16

i realize that so wont the answer be similar like - tan 45... can that even be right?/

Answer 17

yeah tan(-45) = -tan(45)

because tan(-45) = tan(315) = -tan(45)

Answer 18

but can it be the same? is that right... i mean its basically the same thing..

Answer 19

mmm yeah :)
but but I'm not sure if it always works like that, so be careful

Answer 20

thanks so much ! i hate take home tests -_-

Answer 21

LOL I always seem to mess them up some how XD