Prove that 🔥 cos (x - y) = cosx cosy + sinx siny 🔥 Simple proof by

Hey students!!! 🧑‍🎓 🥳 🤠 👏 👩‍🎓
You will learn the proof of a very important trigonometry formula (identity)
cos(x - y) = cosx cosy + sinx siny
in a very easy and simple way.
The formula is one of the basic formulas that is used to derive many more trigonometric formulas. So it becomes extremely important for students to understand the underlying concepts as well.
This formula can be treated as a special case of formula of cos(x + y) which we have already learnt here: • Prove that 🔥 cos (x + ...
#trigonometry #class11maths #class11mathsolution #trigonometricfunctions #trigonometricformula #cosformula #mathsbysunilsir #mathsbysunilsyal #mathemafia #trigonometricidentities
Prove that cos(a - b) = cosa cosb + sina sinb
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[@naveenn7760]

Sir when is next live class for 10th

[@naveenn7760]

Hi

[@Mathemafia]

I conducted few classes but students hardly showed any interest. So I stopped for time being. I may restart near exams.

[@alterego31007]

Sir plz teach in English because iam from Tamil Nadu and iam 11 th STD so plz reply me sir 😢