EXAM 3 REVIEW Flashcards by maeday a

Q

How do you solve cos(2x)?

A

cos²x - sin²x
2cos²x - 1
1 - sin²x

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Q

How do you solve tan(A + B)?

A

(tanA + tanB) / (1 - tanAtanB)

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Q

How do you solve tan(A - B)?

A

(tanA - tanB) / (1 + tanAtanB)

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Q

How do you solve tan(2A)?

A

(2tanA) / (1 - tan²A)

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Q

How do you solve tan(A/2)?

A

(sinA) / (1 + cosA)

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Q

How do you find the direction angle of a vector?

A

tanθ = v₂/v₁

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Q

How do you find the angle between two vectors?

A

cosθ = (uv) / (mag uv)

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