Trigonometry Flashcards by Kyle Young | Brainscape

Q

What is the Cosine rule?

A

a² = b² + c² - 2bcCos(A)

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Q

What is the formula for sec²θ ?

A

1 + tan²θ

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Q

What is the sine rule?

A

a/sinA = b/sinB = c/sinC

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Q

What is tan²θ the same as?

A

Sec²θ - 1

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Q

What is sec²x equal to?

A

Tan²x +1

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Q

What is the formula for sin2x?

A

2sinx cosx

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