Trigonometric Identities
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9 Terms
1
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addition (sin)
sin (A + B) = sin A cos B + cos A sin B
2
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soustraction (sin)
sin (A - B) = sin A cos B — cos A sin B
3
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addition (cos)
cos (A + B) = cos A cos B - sin A sin B
4
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soustraction (cos)
cos (A - B) = cos A cos B + sin A sin B
5
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3 bases
sin2(x) + cos2(x) = 1
tan2(x) +1 = sec2(x)
cot2(x) + 1 = cosec2(x)
6
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angle opposé (sin)
sin (-x) =-sinx
7
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angle opposé (cos)
cos (-x) = cos x
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angle 2x (sin)
sin(2x) = 2 sinxcosx
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angle 2x (cos)
cos(2x) = cos2(x) - sin2(x)
Note 
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