26.03.2020 Views

formule-trigonometrice

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

sin x

23) tgx =

cos x

cos x

24) ctgx =

sin x = 1

tg x

25) tg(a + b) =

tga + tgb

1 − tga ∙ tgb

26) tg2x = 2tgx

1 − tg x

27) tg(a − b) =

tga − tgb

1 + tga ∙ tgb

tga + tgb + tgc − tga ∙ tgb ∙ tgc

28) tg(a + b + c) =

1 − tga ∙ tgb − tgb ∙ tgc − tgc ∙ tga

29) ctg(a + b) =

ctga ∙ ctgb − 1

ctgb + ctga

30) ctg2x = ctg x − 1

2ctgx

31) ctg(a − b) =

ctga ∙ ctgb + 1

ctgb − ctga

32) tg x 2 = sinx

1 + cosx = 1 − cosx

sinx

33) sinx = 2tg x 2

1 + tg x 2

34) cosx = 1 − x

tg 2

1 + tg x 2

35) tgx = 2tg x 2

1 − tg x 2

36) sin π − x = cosx

2

37) cos π − x = sinx

2

38) tg π − x = ctgx

2

2

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!