Question

Find the exact value of : cos(-7pi/4)

Answer 1

HI!!

Answer 2

you got a unit circle cheat sheet?

Answer 3

nope, homeschooled

Answer 4

i like to learn as i take the test, i learn alot better that way

Answer 5

\[\sqrt{2}/2\]

Answer 6

^ can you walk me though it?

Answer 7

find \(-\frac{7\pi}{4}\) on the unit circle on the last page, then look at the corresponding point
the first coordinate is cosine, the second coordinate is sine

Answer 8

\[-\frac{7\pi}{4}\] means count out clockwise in unit of \(\frac{\pi}{4}\)

Answer 9

ohhhhh! thanks misty<3 Nice and pretty haha i may have some more question sbut i got this now!

Answer 10

i think i is\[\sqrt{2}\]

Answer 11

\[\color\magenta\heartsuit\]

Answer 12

don't forget the denominator

Answer 13

its 2 right

Answer 14

yes 2 is the denominator, answer is \[\frac{\sqrt2}{2}\]