Eman  Samir Bhaya, Zaineb Hussain  Abd Al-Sadaa, 
    Constructive Approach of Neural Network Approximation of Trigonometric Activation
Function,
    Journal of Engineering and Applied Sciences,
    Volume 15,Issue 10,
    2020,
    Pages 2343-2347,
    ISSN 1816-949x,
    jeasci.2020.2343.2347,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2020.2343.2347)
    Abstract: There are many uses for approximation using
neural networks including astronomy, image processing
and robots, this is due to its ease of use in approximation.
    Keywords: Image;processing;approximation;networks