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@@ -406,6 +406,10 @@ This is used to classify "powers", that is to say, equations of the form $x^n$,
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#+Caption: Classify Trigonometrics
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#+Name: classify-trigonometrics
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#+BEGIN_SRC lisp
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+ (define-classification trigonometric
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+ (when (classified-as-p expression 'non-atomic)
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+ (member (first expression) '(sin cos tan csc sec cot))))
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+
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(define-classification sin
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(when (classified-as-p expression 'non-atomic)
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(eq 'sin (first expression))))
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