Returns the hyperbolic cosine of x. : Math Functions « Development « Java Tutorial

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import java.io.File;

/* 
 * 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
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public class Main {
  
  /**
   * Returns the <a href="http://mathworld.wolfram.com/HyperbolicCosine.html">
   * hyperbolic cosine</a> of x.
   * 
   * @param x double value for which to find the hyperbolic cosine
   * @return hyperbolic cosine of x
   */
  public static double cosh(double x) {
      return (Math.exp(x) + Math.exp(-x)) / 2.0;
  }
  
}