Double Angle Flashcards

(5 cards)

1
Q

What is the identity for cos(2u) using cos²(u) and sin²(u)?

A

cos(2u) = cos²(u) − sin²(u)

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2
Q

What is the identity for cos(2u) using only cos²(u)?

A

cos(2u) = 2cos²(u) − 1

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3
Q

What is the identity for cos(2u) using only sin²(u)?

A

cos(2u) = 1 − 2sin²(u)

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4
Q

What is the identity for sin(2u)?

A

sin(2u) = 2sin(u)cos(u)

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5
Q

What is the identity for tan(2u)?

A

tan(2u) = (2tan(u)) / (1 − tan²(u))

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