Question

Find the exact values of cosine, sine, and tangent for angle 225˚.

Answer 1

you know the unit circle?

Answer 2

no not quite

Answer 3

well the cos value represents the x value and sin represents the y value on the unit circle and tan is just sin/cos. so they want you to find the x and y value at 225 degrees and y/x at 225 degrees.

Answer 4

so at 225 degrees x or cos225 is \[\frac{ -\sqrt{2} }{ 2 }\]

Answer 5

also sin225 which is just the y value at 225 is \[\frac{ -\sqrt{2} }{ 2 }\]

Answer 6

and therefore tan225 which is just sin225/cos225 or y/x at 225 is 1

Answer 7

thank you that make a whole lot more sense!

Answer 8

I bet it does lol Gotta memorize that unit cicle

Answer 9

i will try

Answer 10

There's tricks you'll learn. good luck

Answer 11

thanks you