Trig Identities

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20 Terms

1

Reciprocal
sinθ =

1/cscθ

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2

Reciprocal
cosθ =

1/secθ

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3

Reciprocal
tanθ =

1/cotθ

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4

Quotient
tanθ =

sinθ/cosθ

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5

Quotient
cotθ =

cosθ/sinθ

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6

Pythagorean
sin²θ + ____ = 1

cos²θ

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7

Pythagorean
1 + ____ = sec²θ

tan²θ

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8

Even-Odd
sin(-θ) =

-sinθ

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9

Even-Odd
cos(-θ) =

cosθ

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10

Even-Odd
tan(-θ) =

-tanθ

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11

Even-Odd
csc(-θ) =

-cscθ

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12

Even-Odd
sec(-θ) =

secθ

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13

Even-Odd
cot(-θ) =

cotθ

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14

Confunction
sin(90°- θ) =

cosθ

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15

Confunction
cos(90°- θ) =

sinθ

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16

Confunction
tan(90°- θ) =

cotθ

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17

Confunction
csc(90°- θ) =

secθ

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18

Confunction
sec(90°- θ) =

cscθ

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19

Confunction
cot(90°- θ) =

tanθ

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20

90° also equals

π/2 (pi over 2)

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