identités trigo Flashcards

1
Q

Quelle identité rassemble les sin^2 et les cos^2?

A

sin^2 + cos^2 = 1

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2
Q

Quelle identité rassemble les sec^2 et les tan^2?

A

tan^2 +1 = sec^2

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3
Q

Quelle identité rassemble les cosec^2 et les cot^2?

A

cot^2 + 1 = cosec^2

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4
Q

sin x * cos x =

A

(sin 2x)/2

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5
Q

sin 2x =

A

2*sin x * cos x

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6
Q

Quelle identité peut-on utiliser pour réduire le degré de sin^2 x?

A

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

quand on dit 2x, c’est le double alors
sin^2 3x = (1 - cos 6x)/2

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7
Q

Quelle identité peut-on utiliser pour réduire le degré de cos^2 x?

A

cos^2 x = (1 + cos 2x)/2

quand on dit 2x, c’est le double alors
cos^2 3x = (1 + cos 6x)/2

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