# Inverse Trigonometric Problem Solve equation for x

#### chapsticks

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

arctan(8x-8)=-1

2. Relevant equations

I'm sure what this part wants.

3. The attempt at a solution

tan[arctan(8x-8)]=tan(-1)
8x-8=tan(-1)
x=(1/8)(tan(-1)+8)
x=(1/8)(-(tan(1)+8)
x=

I am stuck on the last part since the homework says Simplify the above equation. (Round your answers to three decimal places.) and when I put in -2.186 its wrong.

Related Calculus and Beyond Homework News on Phys.org

#### Curious3141

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

arctan(8x-8)=-1

2. Relevant equations

I'm sure what this part wants.

3. The attempt at a solution

tan[arctan(8x-8)]=tan(-1)
8x-8=tan(-1)
x=(1/8)(tan(-1)+8)
x=(1/8)(-(tan(1)+8)
x=

I am stuck on the last part since the homework says Simplify the above equation. (Round your answers to three decimal places.) and when I put in -2.186 its wrong.
Your working is right. I initially thought you were putting the calculator in degrees, but that's not it. You must be doing something else wrong to get that wrong value.

Anyway, put your calculator into radians (RAD) mode and work that out again. Pay attention to where all the brackets are, better still work out what 8 - tan(1) is first, then divide by 8.

#### Dick

Homework Helper
I do not get (1/8)(-tan(1)+8) to be equal to -2.186. How did you get that? What's tan(1)?

#### chapsticks

sorry I just realized that it was for a different problem my answer for this was .805

#### Curious3141

Homework Helper
sorry I just realized that it was for a different problem my answer for this was .805

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving