Calculus: Early Transcendentals, James Stewart, 2015 (Cengage Learning) - A comprehensive and widely-adopted textbook providing a clear introduction to multivariable calculus, including detailed explanations and examples of partial derivatives.
Mathematics for Machine Learning, Marc Peter Deisenroth, A. Aldo Faisal, Cheng Soon Ong, 2020 (Cambridge University Press) - This book covers the mathematical foundations for machine learning, with a chapter dedicated to multivariate calculus that explains partial derivatives directly in the context of ML applications.
Deep Learning, Ian Goodfellow, Yoshua Bengio, Aaron Courville, 2016 (MIT Press) - A standard textbook in deep learning that frequently employs partial derivatives as the basis for gradient descent and backpropagation, showing their practical relevance in machine learning.