Effects of iSpring Suite e-Learning Tool on Performance and Retention in Trigonometry among Senior Secondary School Students in Gusau Metropolis, Zamfara State, Nigeria. Journal of Education, Communication, and Digital Humanities [Internet]. 2026 Aug. 4 [cited 2026 Aug. 9];4(2):801-12. Available from: https://aa.unij.co.uk/index.php/jecdh/article/view/82