Trigonometry Flashcards by John Georgiades

Q

Law of Cosines

A

c² = a² + b² - 2abcosC

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Q

Remember to do what?

A

DRAW A PICTURE

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Q

What is θR?

A

A reference angle between 0 and 2pi radians

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Q

Area of a sector

A

A = 1/2 * r² * θ

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Q

Arc length

A

l = rθ

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Q

sin2x = ?

A

= 2(sinx)(cosx)

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Q

cos2x = ?

A

= cos²x - sin²x = 2cos²x - 1 = 1 - 2sin²x

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