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ISEN/Maths/CIPA3/Fiche de révision DS1.md
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# 2. Identités trigonométrique:
| $\cos(a+b) = \cos(a)\cos(b) - \sin(a)\sin(b)$ |
| :-------------------------------------------: |
| $\sin(a+b) = \sin(a)\cos(b) + \sin(b)\cos(a)$ |
| $\cos(a-b) = \cos(a)\cos(b) + \sin(a)\sin(b)$ |
| $\sin(a-b) = \sin(a)\cos(b) - \sin(b)\cos(a)$ |
| $\cos(a+b) = \cos(a)\cos(b) - \sin(a)\sin(b)$ |
| :------------------------------------------------------: |
| $\sin(a+b) = \sin(a)\cos(b) + \sin(b)\cos(a)$ |
| $\cos(a-b) = \cos(a)\cos(b) + \sin(a)\sin(b)$ |
| $\sin(a-b) = \sin(a)\cos(b) - \sin(b)\cos(a)$ |
| $\cos(a)\sin(b) = \frac{1}{2} [\sin(a+b) + \sin(a - b)]$ |
| $\cos(a)\cos(b) = \frac{1}{2}[\cos(a+b) + \cos(a-b)]$ |
| $\sin(a)\sin(b) = \frac{1}{2}[\cos(a-b)-\cos(a+b)]$ |
# 3. Rappel mathématique