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Trig Identities

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cos(A-B)

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Pre-Calculus

10th

*=dont need to memorize, good to know and be famillar with

21 Terms

1

cos(A-B)

cosAcosB+sinAsinB

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2

cos(A+B)

cosAcosB-sinAsinB

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3

sin(A-B)

sinAcosB-cosAsinB

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4

sin(A+B)

sinAcosB+cosAsinB

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5

tan(A+B)

tanA+tanB

1-tanAtanB

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6

tan(A-B)

tanA-tanB

1+tanAtanB

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7

cos²A+sin²A

1

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8

1+cot²A

csc²A

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9

1+tan²A

sec²A

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10

cos(2A)*

cos²A-sin²A, 1-2sin²A, 2cos²-1

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11

sin(2A)*

2sinAcosA

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12

tan(2A)*

2tanA

1-tan²A

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13

cos(-x)

cos(x)

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14

sec(-x)

sec(x)

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15

sin(-x)

-sin(x)

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16

csc(-x)

-csc(x)

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17

tan(-x)

-tan(x)

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18

cot(-x)

-cot(x)

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19

sin(U/2)*

±sqrt(1-cosU/2)

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20

cos(U/2)*

±sqrt(1+cosU/2)

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21

tan(U/2)*

sinU/1+cosU

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