Trigonometria Flashcards

1
Q

Quais sao as formulas de cos2a, sen2a e tg2a?

A

cos²a-sen²a
2cos²a-1
1-2.sen²a

sen2a=2.sena.cosa

tg2a=2.tga/1-tg²a

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2
Q

Quais sao as funcoes de 3a(cos, sen e tg)

A

cos3a= 4.cos³a - 3.cos.a

sen3a=3.sen a - 4.sen³a

tg3a= 3.tg.a - tg³.a/1-3.tg²a

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3
Q

quais os arcos metade das funcoes ciculares?

A

cos x/2= ±(1+cos x/2)^1/2

sen x/2=±(1-cos x/2)^1/2

tg x/2=±(1-cosx/1+cosx)^1/2

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4
Q

Qual as funcoes trigonometricas a partir de tg x/2?

A

sen x= 2.tg x/2/1+tg²x/2

tgx=2.tgx/2/1-tg²x/2

cosx= 1-tg²x/2 / 1+tg²x/2

bem utilizado para substituir qualquer funcao para tg x/2

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5
Q

Quais sao as fórmulas de Werner?(produto em soma)

A

cos a. cosb= [cos (a+b) + cos (a-b)]/2

sen a . sen b=[ cos (a-b) - cos (a+b)]/2

sen a. cos b= [sen (a+b) + sen (a-b)]/2

precisa da quarta???

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6
Q

Quai sao as formulas de prostaferéze? (soma em produto)

A

cos p + cos q= 2.cos [(p+q)/2]. cos [(p-q)/2]

cos p - cos q=-2.sen [(p+q)/2] . sen [(p-q)/2]

sen p + sen q= 2sen [(p+q)/2]. cos [(p-q)/2]

senp - senq=2.sen [(p-q)/2]. cos [(p+q)/2]

tg p + tg q= sen(p + q)/cos p . cos q

tg p - tg q= sen(p - q)/cos p . cos q

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