In the quiet, dust-moted corners of the Presidency College library, Arjun was hunting for a ghost. Specifically, the "Maity & Ghosh" ghost—the legendary textbook that had steered generations of students through the choppy waters of engineering mathematics.

NPTEL & Open Courseware: If you are struggling with a specific concept from the book, the NPTEL (National Programme on Technology Enhanced Learning) YouTube channel offers free lectures that mirror the Maity & Ghosh syllabus.

Content Scope: Covers 19 to 21 chapters including ordinary differential equations (ODEs), partial differential equations (PDEs), Fourier transforms, and Laplace transforms.

The series solution of this equation is given by: