Find exact value difference identity

[synergix]

Homework Statement

Find the exact value of the expression Tan(3/4-12/5)

Homework Equations

tan(x-y)= (tan3/4 -tan12/5)/ (1+tan3/4tan12/5)

The Attempt at a Solution

I am not sure how to get exact values for these ratios. I haven't been able to get past this point

 

[tiny-tim]

Find the exact value of the expression Tan(3/4-12/5)

Hi synergix!

Why can't you just subtract 12/5 from 3/4, and then look up the tan?

 

[synergix]

I amnot sure what you mean by look up the tan. I get tan(-33/20) when I subtract them. I can get the answer just not the exact answer.

 

[synergix]

uhhhh... I guess that would be the exact answer... maybe I have confused myself haha.. I'm under a bit of pressure right now to get this done perhaps I have overcomplicated this

 

[tiny-tim]

he he