Question

Math question

Answer 1

you can use unit circle

Answer 2

3pi/4 is in what quadrant?

Answer 3

hint: 3/4 is between 1/2 and 1

Answer 4

so 3pi/4 is between pi/2 and pi

Answer 5

so notice the signs of both cos and sin there

Answer 6

cos is the x-coordinates
sin is the y-coordinates
what is the sign of the x-coordinates in that quadrant?

Answer 7

the answer choices I'm looking for:
positive (+)
or
negative (-)

Answer 8

is the x-coordinates in the 2nd quadrant positive or negative?

Answer 9

hmmm... maybe you aren't there

I will ask a summary of what I want to ask:

is the y-coordinates in the 2nd quadrant positive or negative?

is the x-coordinates in the 2nd quadrant positive or negative?

now tan(theta)=y/x, so in the 2nd quadrant tan is positive or negative?