Question

Please Help (pic in comments)

Answer 1

@hartnn

Answer 2

what do you know about the unit circle?

Answer 3

That is is divided into four quadrants and that it is cosine and sine

Answer 4

more specifically,
the co-ordinates are
\(\Large \cos \theta, \sin \theta\)

Answer 5

and we already know,
\(\Large \sin^2 \theta + \cos^2 \theta = 1\)

Answer 6

so, we can say
\(\Large (-4/5)^2+y^2=1\)

makes sense?

Answer 7

so (-4/5) is sin and y is cos?

Answer 8

yes
exactly

Answer 9

what is cosine?

Answer 10

\(\Large (-4/5)^2+y^2=1\)
you got this?

Answer 11

its like sine is given and cosine is asked

Answer 12

find y from that first.
then we need to take care of the sign

Answer 13

I still don't get it

Answer 14

what did you not get?

Answer 15

What I'm supposed to do