Trigonometriska Samband Flashcards

1
Q

cos2x kan skrivas om som?

A

cos^2x-sin^2x
2cos^2x-1
1-2sin^2x

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2
Q

sin2x kan skrivas om som?

A

2sinxcosx

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3
Q

Hur förlänger man cos(x+y)?

A

cosxcosy-sinxsiny

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4
Q

Hur förlänger man sin(x+y)?

A

sinxcosy+sinycosx

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5
Q

Vad är hjälpvinkelsmetoden?

A

asinx + bcosx = Asin(x+p)
där A = sqrt(a^2+b^2)
och p antingen är sinp = a/A eller cosp = b/A

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6
Q

Skriv om sin^2x

A

(1-cos2x)/2

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7
Q

Skriv om cos^2x

A

(1+cos^2x)/2

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8
Q

cos(-x) = ?

A

cosx

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9
Q

sin(-x) = ?

A

-sinx

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10
Q

cos(pi-x) = ?
sin(pi-x) = ?

A

cosx
-sinx

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