ident. trig. Flashcards by Lumie Mü | Brainscape

Q

sen² x + cos² x =

A

1

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Q

cotg² x + 1 =

A

cossec ² x

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Q

tg ² x + 1 =

A

sec² x

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Q

sen(π/2 + x) =

A

cos x

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Q

sen -x =

A

sen x

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Q

cos -x

A

cos x

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Q

tg -x =

A

tg x

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Q

cossec -x =

A

cossec x

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Q

sec -x =

A

sec x

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Q

cotg -x =

A

tg x

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Q

sen(a+b) =

A

sen a . cos x + sen b . cos a

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Q

sen(a - b) =

A

sen a . cos b - sen b . cos a

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Q

cos(a + b) =

A

cos a . cos b - sen a. sen b

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Q

cos(a - b)=

A

cos a . cos b - sen a . sen b

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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

Q

sen(π/2 + x) =

A

cos x

Q

cos(π/2 - x) =

A

sen x

Q

tan (π/2 + x) =

A

cotg x

Q

csc(π/2 - x) =

A

sec x

Q

sec(π/2 - x) =

A

csc x

Q

cotg(π/2 - x) =

A

tan x

Q

sen 2x =

A

senx . cos x

Q

cos 2x =

A

cos² x - sen² x

Ou

2 . cos²x -1

Ou

1 - 2 . sen² x

Q

tan 2x =

A

2 . tan x ÷ 1 - tan² x

Q

sen² x =

A

(1 - cos 2x) ÷ 2

Q

cos² x =

A

(1 + cos 2x) ÷ 2

Q

tan ² x =

A

(1- cos 2x) ÷ (1 + cos 2x

Q

tan x/2 =

A

±√(1 - cos x ÷ 1 + cos x)

Ou

(1- cos x) ÷ sen x

Ou

sen x ÷ (1 + cos x)

Q

sen x/2 =

A

±√(1 - cos x ÷ 2)

Q

cos x/2 =

A

±√(1 + cos x ÷ 2)