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@@ -1500,7 +1500,7 @@ Rules are stored rather simply, in a list of cons cells, with the ~CAR~ being th
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(defvar *rules* '())
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#+END_SRC
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-** WORKING Rules [4/9]
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+** WORKING Rules [5/9]
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:PROPERTIES:
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:CREATED: <2016-06-13 Mon 22:52>
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:ID: fdcebadd-b53d-4f59-99a4-4a3782e017a2
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@@ -1687,11 +1687,20 @@ Differentiation of Multiplicative equations are performed by the product rule.
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`(/ ,(differentiate (cons 'log number)) (* (log ,base) ,number)))
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#+END_SRC
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-*** TODO Trigonometric Functions
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+*** DONE Trigonometric Functions
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+CLOSED: [2016-08-19 Fri 20:36]
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:PROPERTIES:
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:CREATED: <2016-06-14 Tue 10:45>
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:END:
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+The following trig functions are supported:
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+
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+ - Sine :: $f^{\prime}(x) \cdot \cos(f(x))$
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+ - Cosine :: $^{}f^{\prime}(x) \cdot -\sin(f(x))$
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+ - Tangent :: $f^{\prime}(x) \cdot {\sec(f(x))}^2$
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+ - Cosecant :: $f^{\prime}(x) \cdot \left( \csc(f(x)) - \cot(f(x)) \right)$
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+ - Cotangent :: $f^{\prime}(x) \cdot -{\csc(f(x))}^2$
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+
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#+Caption: Trigonometric Functions
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#+Name: sd-trigonometric-functions
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#+BEGIN_SRC lisp
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