Tangent

If you've opened an older workflow and found a bare node called just Tangent - no DF_ prefix - you're looking at a fossil from Derfuu_ComfyUI_ModdedNodes, a math-and-utility pack that's been floating around ComfyUI since 2023. It does exactly what the name says: feed it an angle, get back its tangent (or, with a toggle, the reverse - arctangent).

The pack also ships DF_Tangent, with identical inputs and identical output, in the same Derfuu_Nodes/Math/Trigonometry menu. That's not a duplicate-listing glitch - both are genuinely registered. The bare Tangent reads as an older, pre-DF_-prefix class kept around so workflows that already reference it don't break, while the rest of the pack (DF_Sum, DF_Sinus, DF_Cosines, and so on) has settled on the DF_ naming convention. If you're building a new graph from scratch, use DF_Tangent instead - same behavior, but it's the name that matches everything else in the pack and the one more likely to keep getting maintained.

How it works

Three inputs:

• value (FLOAT, default 1) - the angle, or, with arcTan on, the ratio you want the angle for.
• type_ - RAD or DEG.
• arcTan - flips the node from tangent to its inverse.

One output, a FLOAT: tan(value) with arcTan off - which, unlike sine or cosine, isn't bounded and can swing to very large numbers near 90°/π⁄2 - or the inverse angle with arcTan on.

Trig nodes like this one aren't something a normal txt2img or img2img workflow needs. They show up in more elaborate parametric setups - driving a rotation, staggering a value across a batch on a curve instead of a flat ramp, or any hand-built formula from before ComfyUI had an expression evaluator. If you know rgthree's Power Puter, that's the modern equivalent: one node, a typed formula, no per-operation wiring. Derfuu's approach predates that - one operation, one node.

How to install it

Grab the whole pack - there's no single-node install for a repo like this. ComfyUI Manager: search Derfuu_ComfyUI_ModdedNodes, install, restart. Manually:

cd ComfyUI/custom_nodes
git clone https://github.com/Derfuu/Derfuu_ComfyUI_ModdedNodes

then restart. No models, no unusual dependencies - pure logic, so install rarely goes wrong.

Common issues & troubleshooting

The node isn't visible after installing. Restart the server, then hard-refresh the browser - a stale frontend cache is the standard cause and applies to basically any custom-node pack.

A huge or inf value came out. Expected behavior near 90°/π⁄2 radians, where tangent itself blows up - not a bug in the node.

Worth knowing long-term: Derfuu has a track record of deleting deprecated nodes outright on updates rather than keeping them around labeled "old" - people who've depended on the pack for a while have specifically called this out. If a workflow that used to open cleanly suddenly throws a missing-node error after an update, that's the likely reason; check the GitHub repo for a renamed equivalent before assuming your setup is broken. Given that history, treat a bare-named legacy node like this one as the thing more likely to eventually disappear - DF_Tangent is the safer long-term bet if you're wiring fresh.