Question

how do i find sin and cos from an angle like -3pi/4

Answer 1

I would change it to degrees (easier for me to think about)
then sketch the angle on graph paper

Answer 2

Then find the "reference angle" which will be the acute angle it makes with the x-axis

Answer 3

i know it equals -135 degrees but i am confused if the cos and sign would be (-sqrt2/2,sqrt2/2) or (-sqrt2/2,-sqrt2/2) because wouldnt you just got the clockwise when dealing with negative degrees and 135 degrees would put you in the third quadrant?

Answer 4

**-135 degrees would put you in the third quadrant?

Answer 5

yes, -135 means start at the positive x-axis and go clockwise