Moved - trig functions of angles and etc

[Nickiq246]

I need some help. I haven't figured out how they got sqr 2 for R. I thought it would be sqr 168 or something.

Assume that alpha is an angle in standard position whose terminal side contains the point (8,-8). Find the exact values of the following functions.

Thanks in advance...

 

[Deleted member 4993]

I need some help. I haven't figured out how they got sqr 2 for R. I thought it would be sqr 168 or something.

Assume that alpha is an angle in standard position whose terminal side contains the point (8,-8). Find the exact values of the following functions.

Thanks in advance...

Your problem statement is incomplete.

Which functions?

Please share your work with us.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/th...217#post322217

We can help - we only help after you have shown your work - or ask a specific question (e.g. "are these correct?")

 

[DrPhil]

I need some help. I haven't figured out how they got sqr 2 for R. I thought it would be sqr 168 or something.

Assume that alpha is an angle in standard position whose terminal side contains the point (8,-8). Find the exact values of the following functions.

Thanks in advance...

R^2 = (-8)^2 + 8^2 = 128
....R = sqrt(128) = 8 * sqrt(2)

If they renormalized everything by dividing by 8, then R = sqrt(2) and the two legs of the triangle are -1 in the x-direction and +1 in the y-direction.