- Formules de la tangente.
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Lesson overview
This lesson brings together the PDF, study notes and chapter flow so you can revise Calcul trigonométrique without losing the thread.
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cos (x − y) = cosx. cosy + sinx. siny (1)
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cos (x + y) = cosx. cosy − sinx. siny (2)
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sin (x + y) = sinx. cosy + cosx. siny (3)
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sin (x − y) = sinx. cosy − cosx. siny (4)
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cos(2x) = 2cos2x − 1 et cos(2x) = 1 − 2sin2x
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1 cos 2
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cos 2 2
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sin 2 2
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What to work through
1 exercise(s) found across 1 page(s), with no solutions included.
Lesson objective
Master "Summary 1 - Calcul trigonométrique" in Calcul trigonométrique (Mathematics) and use it in exercises.
Quick method
Start with definitions, learn formulas/processes, redo one example, then solve one exercise without the correction.