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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.math3.analysis.function;
+
+import org.apache.commons.math3.analysis.FunctionUtils;
+import org.apache.commons.math3.analysis.UnivariateFunction;
+import org.apache.commons.math3.analysis.DifferentiableUnivariateFunction;
+import org.apache.commons.math3.analysis.differentiation.DerivativeStructure;
+import org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableFunction;
+import org.apache.commons.math3.util.FastMath;
+
+/**
+ * Hyperbolic arc-sine function.
+ *
+ * @since 3.0
+ */
+public class Asinh implements UnivariateDifferentiableFunction, DifferentiableUnivariateFunction {
+ /** {@inheritDoc} */
+ public double value(double x) {
+ return FastMath.asinh(x);
+ }
+
+ /** {@inheritDoc}
+ * @deprecated as of 3.1, replaced by {@link #value(DerivativeStructure)}
+ */
+ @Deprecated
+ public UnivariateFunction derivative() {
+ return FunctionUtils.toDifferentiableUnivariateFunction(this).derivative();
+ }
+
+ /** {@inheritDoc}
+ * @since 3.1
+ */
+ public DerivativeStructure value(final DerivativeStructure t) {
+ return t.asinh();
+ }
+
+}