Question

evaluate sin 3pi/4 in terms of pi
(will award medal if you help me out)

Answer 1

this is what you do
locate \(\frac{3\pi}{4}\) on the unit circle on the last page of the attached cheat sheet
then find the coordinates of the point corresponding to that angle
the first coordinate is cosine and the second coordinate is sine

Answer 2

let me know what you get
btw the "in terms of \(\pi\)" makes no sense at all

Answer 3

okay it says \[(\frac{-\sqrt2}{2}, \frac{ \sqrt2 }{ 2 } )\]

Answer 4

and the "in terms of pie" was on my worksheet thing

Answer 5

yes it certainly does
so
\[\sin(\frac{3\pi}{4})=\frac{\sqrt2}{2}\]

Answer 6

really? can you post a screen shot? i would love to see it

Answer 7

oh thats it?

Answer 8

yup and
\[\cos(\frac{3\pi}{4})=-\frac{\sqrt2}{2}\] and also
\[\tan(\frac{3\pi}{4})=-1\] as it is sine over cosine
easy right?

Answer 9

all you need to do is find the coordinate of the point corresponding to the angle, and remember that the first coordinate is cosine and the second is sine
i still want to know what "in terms of \(pi\)" means
is your teacher a bit confused?

Answer 10

i'm not sure... its an online course. i have no face to face contact with whatever makes the worksheets

Answer 11

i think they want to use pi as base unit

Answer 12

just scale ur answer by pi

Answer 13

let \(f(x)=x^2+x\) find \(f(3)\) in terms of \(\pi\)

Answer 14

makes no damned sense at all
sine is a function and
\[\sin(\frac{3\pi}{4})=\frac{\sqrt2}{2}\] a number

Answer 15

it is not "in terms" of anything

Answer 16

let me guess FLVS idiots strike again?

Answer 17

\[\sin(\frac{3\pi}{4})=\frac{\sqrt{2}}{2}+0 \pi \text{ lol }\]

Answer 18

some teachers are too smart they want students to compare the value of sin in terms of pi because pi is a measure of half the circumference of unit circle

Answer 19

sine is a function
put in a number
get out a number

Answer 20

@giniasal can you PLEASE post a screen shot? i would love to see the question and the question id number

Answer 21

\[\dfrac{\sqrt{2}}{2 } \approx 0.225 \pi \]

Answer 22

lord

Answer 23

it is instructed before the "practice" begins that we do everything "in terms of pi"

Answer 24

i don't see any pies in your options ?

Answer 25

maybe it meant everything that can be written in terms of pi
not things that cannot be written in terms of pi

Answer 26

i dont know?! you think if i grasped it properly i'd be asking basic trig questions on this website?

Answer 27

like for example arcsin(1)=pi/2
arcsin(1) can be written in terms of of pi
some people would think an approximation to arcsin(1) would be ok if the teacher does not express she wants exact answer or the answer in terms of pi

Answer 28

if it was me
I would probably have said instead express all answers in exact form

Answer 29

but then I guess you could say arcsin(1)=90 deg

Answer 30

and maybe that is why she said in terms of pi