--User changes

-cosh, coth, csch, sech, sinh, tanh: Scale inputs by PI/4. This will produce different results, but is technically more correct.

--Code changes
 -cos, csch: move position of sign flip, shouldn't change output.
 -cot, coth, csc, csch, sec, sech, tan, tanh: add optimization.

Source/Ember/VarFuncs.h

@@ -301,6 +301,17 @@ public:
 		return v2T(a.x + x, a.y);
 	}
 
+	/// <summary>
+	/// Subtract complex from complex.
+	/// </summary>
+	/// <param name="a">The first complex number</param>
+	/// <param name="b">The second complex number</param>
+	/// <returns>a - b</returns>
+	static v2T ComplexMinusComplex(v2T a, v2T b)
+	{
+		return v2T(a.x - b.x, a.y - b.y);
+	}
+
 	/// <summary>
 	/// Subtract real from complex.
 	/// </summary>
@@ -333,6 +344,16 @@ public:
 		return v2T(T(0.5) * std::log(a.x * a.x + a.y * a.y), std::atan2(a.y, a.x));
 	}
 
+	/// <summary>
+	/// Compute the inverse of the natural logarithm of a complex number.
+	/// </summary>
+	/// <param name="a">The complex number</param>
+	/// <returns>exp(a)</returns>
+	static v2T ComplexExp(v2T a)
+	{
+		return v2T(std::cos(a.y), std::sin(a.y)) * std::exp(a.x);
+	}
+
 	/// <summary>
 	/// Retrieve information about a piece of shared data by looking
 	/// up its name.