Show equation of tangent

[swisscow]

Thanks for your help. It's really easy on the Casio fx to do this and it's a big help for my students for the equation to appear on the screen. These workarounds work fine but it's not as straightforward as I'd like. I'm hoping to switch away from TI calls at school but I need to convince others that the prime is the way to go.

Thanks again, and Swiss cows may not speak French, but they muddle by. This one mores in German