Trig Double Angle Identities Flashcards

1
Q

sin2θ

A

2sinθcosθ

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2
Q

cos2θ

A

cos²θ - sin²θ

2cos²θ - 1

1 - 2sin²θ

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3
Q

tan2θ

A

(2tanθ)/(1 - tan²θ)

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4
Q

Law of Cosines

A

c² = a² + b² - 2ab * cosC

a² = b² + c² - 2bc * cosA

b² = a² + c² - 2ac * cosB

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5
Q

Law of Sines

A

sinA/a = sinB/b = sinC/c

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