trig test 3 formulas

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13 Terms

1
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sin a+b

sin a cos b + cos a sin b

2
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sin a - b

sin a cos b - cos a sin b

3
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cos a + b

cos a cos b - sin a sin b

4
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cos a - b

cos a cos b + sin a sin b

5
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tan a+b

tan a + tan b / 1 - tan a tan b

6
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tan a-b

tan a - tan b/ 1+ tan a tan b

7
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sine formula trick

keeps the sign

8
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cosine formula trick

switches the sign

9
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tangent trick

has a fraction, initial sign takes the top. bottom is reverse

10
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double angle

whenever you see 2x

11
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sin(2x) =

2 sin x cos x

12
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cos 2x =




13
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tan 2x

2 tan x / 1 - tan²x