trigonometric identities Flashcards by trina Unknown | Brainscape

Q

arc length

A

rθ

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Q

area of a sector (radians)

A

1/2 r^2θ

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Q

1+cot^2θ

A

cosec^2θ

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Q

1+tan^2θ

A

sec^2θ

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Q

sin(2A)

A

2sinAcosA

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Q

cos(2A)

A

cos^2A-sin^2A
1-2sin^2A
2cos^2a-1

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Q

tan (2A)

A

2 tan A
____________
1 − tan²A

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Q

a^2

A

b^2+c^2 - 2bccosa

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Q

cos²x

A

1/2+1/2cos2x

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Q

sin²x

A

1/2-1/2cos2x

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Q

integral of cos2x

A

1/2sin 2x

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Q

integral of sin2x

A

-1/2cos 2x

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Q

integral of sin²x

A

1/2x - 1/4sin2x

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Q

integral of cos²x

A

1/2x + 1/4sin2x

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Q

integral of e²ˣ

A

1/2e²ˣ

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Q

area of a sector (degrees)

A

angle/360 * pi*r^2