Basic Trigonometric Identities (Equations)

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13 Terms

1

cos (A - B)

cos A cos B + sin A sin B

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2

cos (A + B)

cos A cos B - sin A sin B

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3

sin (A + B)

sin A cos B + cos A sin B

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4

sin (A - B)

sin A cos B - cos A sin B

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5

sin 2x

2 sin x cos x

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6

cos 2x (1)

1 - 2 sin² x

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7

cos 2x (2)

cos² x - sin² x

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8

cos 2x (3)

2 cos²x - 1

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9

tan (A + B)

(tan A + tan B) / (1 - tan A tan B)

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10

tan (A - B)

(tan A - tan B) / (1 + tan A tan B)

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11

tan 2x

2 tan x / (1 - tan² x)

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12

Pythagorean Identities

sin² x + cos² x = 1

1 + tan² x = sec² x,

1 + cot² x = csc² x.

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13
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