Trigonometrie formule Flashcards by Bianca Luchian

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Q

sin (a+b)

A

sin a* cos b+ sin b* cos a

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Q

sin (a-b)

A

sin a cos b -sin bcos a

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Q

cos (a+b)

A

cos a* cos b - sin a * sin b

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Q

cos (a-b)

A

cos a *cos b + sin a * sin b

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Q

sin x

A

cos (90-x)

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Q

cos x

A

sin (90-x)

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Q

tg (a+b)

A

tg a+ tg b / 1- tg a *tg b

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Q

tg (a-b)

A

tg a- tg b / 1+ tg a *tg b

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Q

ctg (a+b)

A

ctg a *ctg b - 1/ ctg b+ ctg a

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Q

ctg (a-b)

A

ctg a * ctg b + 1/ ctg b - ctg a

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Q

sin 2x

A

sin xcos x2

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Q

cos 2x

A

1- 2sinx ^ 2

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Q

tg 2x

A

2tg x/ 1- tg ^2 x

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Q

ctg 2x

A

ctg ^2 x -1/ 2 ctg x

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Q

sin 3x

A

3 sin x - 4 sin ^3 x

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Q

cos 3x

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A

4 cos^3 x - 3 cos x