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-rw-r--r--build/website/mathematics/calculus/source/derivative.ms4
1 files changed, 2 insertions, 2 deletions
diff --git a/build/website/mathematics/calculus/source/derivative.ms b/build/website/mathematics/calculus/source/derivative.ms
index 9e4196f..681e019 100644
--- a/build/website/mathematics/calculus/source/derivative.ms
+++ b/build/website/mathematics/calculus/source/derivative.ms
@@ -205,10 +205,10 @@ d sub initial = f(t sub {initial})
d sub final = f(t sub {final})
.EN
.EQ
-\[*D]t = f(t sub initial + \[*D]t) - d sub initial
+\[*D]d = f(t sub initial + \[*D]t) - d sub initial
.EN
.EQ
-\[*D]t = f(t sub initial + \[*D]t) - f(t sub {initial})
+\[*D]d = f(t sub initial + \[*D]t) - f(t sub {initial})
.EN
.EQ
f'(t) = {f(t sub initial + \[*D]t) - f(t sub {initial})} over \[*D]t