# Homework Help: Calculator problem

1. Jan 23, 2008

### starchild75

1. The problem statement, all variables and given/known data

I typed in cos of -0.175 and I got .999999 and the physics book says it's 100. help!!!!

2. Relevant equations

3. The attempt at a solution

2. Jan 23, 2008

cos() of anything is never going to be 100. It is always in the range of [-1,1]. You would have to scale it to reach 100, that is 100*cos()

3. Jan 24, 2008

### physixguru

i think this is enough for hint....

cos[-x]=cos x...

4. Jan 24, 2008

### Leong

$$cos^{-1} (-0.175) = 100^0$$