Trig Identities

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23 Terms

1

sinx =

1/cscx

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2

cscx =

1/sinx

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3

cosx =

1/sec

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4

secx

1/cosx

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5

tanx =

1/cotx

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6

cotx =

1/tanx

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7

sin(-x)

-sin(x)

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8

cos(-x)

cos(x)

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9

tan(-x)

-tan(x)

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10

csc(-x)

-csc(x)

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11

sec(-x)

sec(x)

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12

cot(-x)

-cot(x)

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13

sin²x+cos²x =

1

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14

1+cot²x =

csc²x

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15

tan²x + 1 =

sec²x

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16

Difference of squares

a² - b² = (a + b)(a - b)

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17

x²-1

= (x + 1)(x - 1)

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18

sin(pi/2 - x)

cos(x)

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19

tan(pi/2 -x)

cot(x)

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20

sec(pi/2-x)

csc(x)

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21

cos(pi/2 - x)

sin(x)

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22

cot(pi/2 - x)

tan(x)

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23

csc(pi/2 - x)

sec(x)

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