trig sum/difference + double angle identities

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Last updated 11:46 AM on 4/8/26
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7 Terms

1
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sin (a+b)

sin a cos b ± cos a sin b

2
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cos (a+b)

cos a cos b ± sin a sin b

3
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tan (a+b)

(tan a + tan b)/1 - tan a tan b

4
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sin 2x

2 sin x cos x

5
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cos 2 x

1 - 2 sin² x

6
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cos 2x

2 cos² x - 1

7
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tan 2 x

2 tan x / 1 - tan² x