Trigonometrie Flashcards

1
Q

Sin(a+-b)

A

Sin a * cos b +- sin b * cos a

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2
Q

Cos (a + b)
Cos (a - b)

A

Cos a * cos b - sin a * sin b
Cos a * cos b + sin a * sin b

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3
Q

Sin 2x

A

2 *sin x * cos x

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4
Q

Cos 2x

A

Cos^2 x - sin^2 x

2cos^2 x - 1

1- 2sin^2 x

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5
Q

Sin 3x

A

3 * sin x - 4* sin^3 x

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6
Q

Cos 3x

A

4 * cos^3 x - 3 * cos x

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7
Q

Sin x/2

A

+- (1 - cos x) / 2 totul sub radical iar semnul depinde de cadran

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8
Q

Cos x / 2

A

+- (1 + cos x)/2 totul sub radical iar semnul depinde de cadran

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9
Q

Sin^2 x + cos^2 x

A

1

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10
Q

Sin a + sin b

A

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

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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

Cos a + cos b

A

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

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13
Q

Cos a - cos b

A

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

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14
Q

Sin x

A

Cos (pi/2 - x)

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15
Q

Cos x

A

Sin (pi/2 - x)

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16
Q

Sin x * sin y

A

[ cos (x - y) + cos (x + y) ] / 2

17
Q

Sin x * cos y

A

[ sin (x + y) + sin (x - y) ] / 2

18
Q

Cos x * cos y

A

[ cos (x + y) + cos (x - y) ] / 2