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

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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.

#trigonometry #class11maths #class11mathsolution #trigonometricfunctions #trigonometricformula #cosformula #mathsbysunilsir #mathsbysunilsyal #mathemafia #trigonometricidentities

Prove that cos(a - b) = cosa cosb + sina sinb

  1. Mathemafia
  2. cos (x-y) derivation
  3. cos(x-y) formula
  4. prove geometrically cos(x-y) = cosx cosy sinx siny
  5. cos x cos y sin x sin y formula
  6. cos(x-y)=cosx.cosy sinx.siny derivation
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