add more division overloads to support mccormick atan etc.

examples/mccormick/mccormick.cu

@@ -35,7 +35,10 @@ constexpr auto f(auto x, auto y)
     // auto a = log(x);
     // auto a = recip(x);
     // auto a = cos(x);
-    auto a = tanh(x);
+    // auto a = tanh(x);
+    auto a = atan(x);
+    // auto a = asin(x);
+    // auto a = acos(x);
     // auto a = pown(x, 3);
     // auto a = pown(x, 4);
     // auto a = pow(x, 4);

include/cutangent/arithmetic/basic.cuh

@@ -103,6 +103,30 @@ fn tangent<T> operator/(tangent<T> a, tangent<T> b)
     return { a.v / b.v, (a.d * b.v - a.v * b.d) / (b.v * b.v) };
 }
 
+template<typename T>
+fn tangent<T> operator/(T a, tangent<T> b)
+{
+    return { a / b.v, (-a * b.d) / (b.v * b.v) };
+}
+
+template<typename T>
+fn tangent<T> operator/(tangent<T> a, T b)
+{
+    return { a.v / b, a.d / b };
+}
+
+template<typename T>
+fn tangent<T> operator/(std::integral auto a, tangent<T> b)
+{
+    return { a / b.v, (-a * b.d) / (b.v * b.v) };
+}
+
+template<typename T>
+fn tangent<T> operator/(tangent<T> a, std::integral auto b)
+{
+    return { a.v / b, a.d / b };
+}
+
 template<typename T>
 fn tangent<T> max(tangent<T> a, tangent<T> b)
 {