Math trig identities Flashcards by Anita Joseph | Brainscape

Q

basic trig formulas

A

sin^2x+cos^2x=1
1+cot^2x=csc^2x
tan^2x+1=sec^2x

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Q

sin2x

A

2sinxcosx

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Q

cos2x

A

cos^2x - sin^2x
1 - 2sin^2x
2cos^2x - 1

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Q

cos(x+y)

A

cosxcosy-sinxsiny

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Q

cos(x-y)

A

cosxcosy+sinxsiny

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Q

sin(x+y)

A

sinxcosy+sinycosx

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Q

sin(x-y)

A

sinxcosy-sinycosx

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