Expert: Richard J. Raridon - 10/17/2005

Question
Give an exact value and draw a reference triangle
   1) Sin(inverse of cos3/4)
   2) Cos(inverse of sin5/3)
   3) Tan(inverse of cot5)

I figured out the rest of the problems but these ones gave me some trouble

Answer
You can write the inverse of cos(3/4) as cos^-1(3/4).
It simply means "what angle has a cosine of 3/4?"
Most calculators have sin^-1, cos^-1, and tan^-1 keys.
1) sin(41.4) = 0.66
2) you can't have an angle with a sine of 5/3
3) tan(11.3) = 0.2
I can't draw triangles for you.