1 Flashcards

1
Q

sin (a+b)

A

sin a . cos b + cos a . sin b

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2
Q

sin (a-b)

A

sin a . cos b - cos a . sin b

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3
Q

cos (a+b)

A

cos a . cos b - sin a . sin b

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4
Q

cos (a-b)

A

cos a . cos b + sin a . sin b

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5
Q

sin 2a

A

2 sin a. sin b

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6
Q

cos 2a (1)

A

cos^2 - sin^2

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7
Q

cos 2a (2)

A

2 cos^2 - 1

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8
Q

cos 2a (3)

A

1 - 2 sin^2

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9
Q

2 cos^2

A

cos 2a + 1

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10
Q

2 sin^2

A

1 - cos 2a

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11
Q

sin a + sin b

A

2 sin (a+b)/2 . cos (a-b)/2

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12
Q

sin a - sin b

A

2 cos (a+b)/2 . sin (a-b)/2

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13
Q

cos a + cos b

A

2 cos (a+b)/2 . cos (a-b)/2

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14
Q

cos a - cos b

A

– 2 sin (a+b)/2 . sin (a-b)/2

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15
Q

sin a . cos b

A

1/2 (sin a+b + sin a-b)

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16
Q

cos a . sin b

A

1/2 ( sin a+b - sin a-b)

17
Q

cos a . cos b

A

1/2 (cos a+b + cos a-b)

18
Q

sin a . sin b

A

1/2 (cos a-b - cos a+b)