From bea7ec33c1d0a7d64e50e42d00a941a2f84408c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=A9my=20Audiger?=
 <31616285+jaudiger@users.noreply.github.com>
Date: Mon, 6 Feb 2023 13:43:00 +0100
Subject: [PATCH] Update few examples of math commands (#7987)

# Description

I just updated a few examples linked to math commands.

I used the character of pi where possible, and I updated one example
since the example was misleading IMO (for the tau command).

# User-Facing Changes

Only examples have been updated, there is no real user changes.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
---
 crates/nu-command/src/math/cos.rs  | 2 +-
 crates/nu-command/src/math/tan.rs  | 2 +-
 crates/nu-command/src/math/tanh.rs | 2 +-
 crates/nu-command/src/math/tau.rs  | 6 +++---
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/crates/nu-command/src/math/cos.rs b/crates/nu-command/src/math/cos.rs
index 80606c76ae..95a97ea8c3 100644
--- a/crates/nu-command/src/math/cos.rs
+++ b/crates/nu-command/src/math/cos.rs
@@ -48,7 +48,7 @@ impl Command for SubCommand {
     fn examples(&self) -> Vec<Example> {
         vec![
             Example {
-                description: "Apply the cosine to pi",
+                description: "Apply the cosine to π",
                 example: "math pi | math cos",
                 result: Some(Value::test_float(-1f64)),
             },
diff --git a/crates/nu-command/src/math/tan.rs b/crates/nu-command/src/math/tan.rs
index c03956a625..b756ce574e 100644
--- a/crates/nu-command/src/math/tan.rs
+++ b/crates/nu-command/src/math/tan.rs
@@ -48,7 +48,7 @@ impl Command for SubCommand {
     fn examples(&self) -> Vec<Example> {
         vec![
             Example {
-                description: "Apply the tangent to pi/4",
+                description: "Apply the tangent to π/4",
                 example: "(math pi) / 4 | math tan",
                 result: Some(Value::test_float(1f64)),
             },
diff --git a/crates/nu-command/src/math/tanh.rs b/crates/nu-command/src/math/tanh.rs
index 679e1d1fda..89d4352a7f 100644
--- a/crates/nu-command/src/math/tanh.rs
+++ b/crates/nu-command/src/math/tanh.rs
@@ -45,7 +45,7 @@ impl Command for SubCommand {
 
     fn examples(&self) -> Vec<Example> {
         vec![Example {
-            description: "Apply the hyperbolic tangent to 10*pi",
+            description: "Apply the hyperbolic tangent to 10*π",
             example: "(math pi) * 10 | math tanh",
             result: Some(Value::test_float(1f64)),
         }]
diff --git a/crates/nu-command/src/math/tau.rs b/crates/nu-command/src/math/tau.rs
index efbd93071a..d18e8458e4 100644
--- a/crates/nu-command/src/math/tau.rs
+++ b/crates/nu-command/src/math/tau.rs
@@ -29,9 +29,9 @@ impl Command for SubCommand {
     #[allow(clippy::approx_constant)]
     fn examples(&self) -> Vec<Example> {
         vec![Example {
-            example: "(math tau) / 2",
-            description: "Compare π and τ",
-            result: Some(Value::test_float(std::f64::consts::PI)),
+            example: "math tau | math round --precision 2",
+            description: "Get the first two decimal digits of τ",
+            result: Some(Value::test_float(6.28)),
         }]
     }