Tous les sujets
Maths
Physique-Chimie
Corrigés de BAC- Révisions Maths lycée
- Prépa Examens
- Tous les sujets
- Maths
- Physique-Chimie
- Corrigés de BAC
- Révisions Maths lycée
- Prépa Examens
Proving Identities with Compound Angle Formulae
In this video, the speaker demonstrates how to prove that cot y equals sec x plus tan x, given that sine of y equals cos of x plus y. To begin, the speaker notes that the compound angle formula can be used because the cosine function has x and y in it. The speaker then uses the formula for cosine x plus y, substituting it into the equation to begin simplifying it. The speaker divides everything by sine y and brings out the cot y term. Then, they divide everything by cos x, bringing out the sec x and tan x terms. The final step involves rearranging the terms to achieve the desired equation. The speaker concludes that practice is key to mastering this type of problem.
