Cos (x – y) Trigonometric Identity | Class 11 | NCERT Maths

In this video/post, we learn the important trigonometric identity of Class 11 NCERT: cos (x – y) = cos x cos y + sin x sin y We explain the formula with concept, geometric visualization, shortcuts, and examples, making it easy to remember for exams. Mastering this identity will help you solve numerical problems based on compound angles, transformations, and simplifications quickly and accurately. 📚 Topics Covered: ✔ Cos (x – y) derivation ✔ NCERT Class 11 formula explanation ✔ Shortcut to memorize ✔ Example questions for JEE / CBSE 👍 Don’t forget to LIKE, SHARE & SUBSCRIBE for more Maths formula tricks and exam-oriented videos! #cosxminusy #trigonometricidentity #class11maths #maths #ncertmaths #compoundangles #jeemaths #mathsformulas #trigonometryclass11 #examtricks #iitpreparation #neetpreparation #cbse