MEMORIZE Flashcards

1
Q

Pythagorean identities equal to 1.

A
  1. sin²a + cos²a = 1
  2. sec²a - tan²a = 1
  3. csc²a - cot²a = 1
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2
Q

1/sin x

A

csc x

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3
Q

1/cos x

A

sec x

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4
Q

1/tan x

A

cot x

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5
Q

sin²a

A
  1. 1-cos²a
  2. ½(1-cos2a)
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6
Q

cos²a

A
  1. 1-sin²a
  2. ½(1+cos2a)
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7
Q

sec²a

A

tan²a + 1

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8
Q

tan²a

A
  1. sec²a-1
  2. 1-cos2a / 1+cos2a
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9
Q

csc²a

A

cot²a + 1

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10
Q

cot²a

A

csc²a - 1

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11
Q

sin(a+b)

A

sin a cos b + cos a sin b

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12
Q

sin(a-b)

A

sin a cos b - cos a sin b

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13
Q

cos(a+b)

A

cos a cos b - sin a sin b

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14
Q

cos(a-b)

A

cos a cos b + sin a sin b

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15
Q

tan(a+b)

A

tan a + tan b / 1-tan a tan b

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16
Q

tan(a-b)

A

tan a - tan b / 1+ tan a tan b

17
Q

sin2a

A

2sin a cos a

18
Q

cos2a

A

cos²a - sin²a

19
Q

tan2a

A

2tana / 1 - tan²a