diff --git a/CHANGELOG.md b/CHANGELOG.md
index e859dce..25db6e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## 1.1.1
+
+- `DynamicNumber`:
+  - Added `sin` and `cos`.
+
+- test: ^1.25.8
+- coverage: ^1.8.0
+
 ## 1.1.0
 
 - sdk: '>=3.3.0 <4.0.0'
diff --git a/lib/src/statistics_decimal.dart b/lib/src/statistics_decimal.dart
index 0b0d4df..8e3adef 100644
--- a/lib/src/statistics_decimal.dart
+++ b/lib/src/statistics_decimal.dart
@@ -1417,6 +1417,12 @@ class Decimal implements DynamicNumber<Decimal> {
   @override
   DynamicInt operator ~() => ~toDynamicInt();
 
+  @override
+  Decimal get sin => Decimal.fromDouble(math.sin(toDouble()));
+
+  @override
+  Decimal get cos => Decimal.fromDouble(math.cos(toDouble()));
+
   @override
   Decimal get square => this * this;
 
diff --git a/lib/src/statistics_dynamic_int.dart b/lib/src/statistics_dynamic_int.dart
index 876efa6..c177e98 100644
--- a/lib/src/statistics_dynamic_int.dart
+++ b/lib/src/statistics_dynamic_int.dart
@@ -313,6 +313,12 @@ abstract class DynamicNumber<T extends DynamicNumber<T>>
   /// Euclidean modulo for [DynamicInt] [n2].
   T moduloDynamicInt(DynamicInt n2);
 
+  /// The sine of this number.
+  Decimal get sin;
+
+  /// The cosine of this number.
+  Decimal get cos;
+
   /// The square of this number.
   T get square;
 
@@ -815,6 +821,12 @@ abstract class DynamicInt implements DynamicNumber<DynamicInt> {
   @override
   DynamicInt moduloDynamicInt(DynamicInt other);
 
+  @override
+  Decimal get sin => Decimal.fromDouble(math.sin(toInt()));
+
+  @override
+  Decimal get cos => Decimal.fromDouble(math.cos(toInt()));
+
   @override
   DynamicInt get square => (this * this).toDynamicInt();
 
diff --git a/lib/src/statistics_forecast.dart b/lib/src/statistics_forecast.dart
index 304b4ce..fcfcd28 100644
--- a/lib/src/statistics_forecast.dart
+++ b/lib/src/statistics_forecast.dart
@@ -168,7 +168,7 @@ abstract class EventForecaster<T, V, F> {
         if (dependencyNotificationRatio >= 1 ||
             _random.nextDouble() < dependencyNotificationRatio) {
           var dependentObservations =
-              combination.map((id) => observationsByID[id]).whereNotNull();
+              combination.map((id) => observationsByID[id]).nonNulls;
 
           _notifyConclusion(source, dependentObservations, event, value,
               dependency: true);
diff --git a/pubspec.yaml b/pubspec.yaml
index 0363898..5dfadd3 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: statistics
 description: Statistics package for easy and efficient data manipulation with built-in Bayesian Network (Bayes Net), many mathematical functions and tools.
-version: 1.1.0
+version: 1.1.1
 homepage: https://github.com/gmpassos/statistics
 
 environment:
@@ -13,9 +13,9 @@ dependencies:
 
 dev_dependencies:
   lints: ^3.0.0
-  test: ^1.25.2
+  test: ^1.25.8
   dependency_validator: ^3.2.3
-  coverage: ^1.7.2
+  coverage: ^1.8.0
 
 #dependency_overrides:
 #  data_serializer: