Lượng giác Flashcards

1
Q

cos đối sin bù phụ chéo khác pi tang

A

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2
Q

tan^2(x) + 1

A

tan^x + 1 = cos^-2(x)

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3
Q

cot^2(x) + 1

A

cot^2(x) + 1 = sin^-2(x)

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4
Q

sin(2x)

A

2sin(x)cos(x)

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5
Q

cos(2x)

A

cos^2(x)-sin^2(x) = 2cos^2(x) - 1 = 1 - 2sin^2(x)

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6
Q

sin(a+-b)

A

sin(a)cos(b)+-cos(a)sin(b)

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7
Q

cos(a+-b)

A

cos(a)cos(b)-+sin(a)sin(b)

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8
Q

tan(a+-b)

A

(tan(a)+-tan(b))/1-+tan(a)tan(b)

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9
Q

sin(a)+sin(b)

A

2sin()cos()

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10
Q

sin(a)-sin(b)

A

2cos()sin()

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11
Q

cos(a)+cos(b)

A

2cos()cos()

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12
Q

cos(a)-cos(b)

A

-2sin()sin()

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13
Q

tan(a)+-tan(b)

A

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

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14
Q

Định lí hàm số sin

A

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15
Q

Định lí hàm số cos

A

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