angle fromula Flashcards by Eva Kelly

Q

Cosine rule

A

a²=b²+c²-2bccosA

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Q

Area of a trianlge

A

½absinC

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Q

1

A

Cos²x+sin²x

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Q

Sec²x

A

1+tan²x

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Q

Cosec²x

A

1+cot²x

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Q

Sin2x

A

2sinxcosx

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Q

Cos2x

A

Cos²x-sin²x
2cos²x-1
1-2sin²x

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Q

Tan2x

A

(2tanx)/ (1-tan²x)

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