Trig Identities Flashcards by Ed S | Brainscape

Q

sinx divided by cosx

A

tan x

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Q

sin^2 + cos^2

A

1

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Q

1-sin^2

A

cos^2

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Q

1-cos^2

A

sin^2

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Q

1/sinx

A

cscx

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Q

cosx/sinx

A

cotx

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Q

1/cosx

A

secx

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Q

1/tanx

A

cotx

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Q

tan^2 + 1

A

sec^2

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Q

cot^2 + 1

A

csc^2

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Q

sin(-x)

A

-sinx

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Q

cos(-x)

A

cosx

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Q

tan(-x)

A

-tanx

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Q

sin((pi divided by 2)-x)

A

cosx

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Q

sin (s+t)

A

sin(s) cos(t) + cos(s) sin(t)

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Q

sin(s-t)

A

sin(s) cos(t) - cos(s) sin(t)

Q

cos (s+t)

A

cos(s) cos(t) - sin(s) sin(t)

Q

cos (s-t)

A

cos(s) cos(t) + sin(s) sin(t)

Q

tan(s+t)

A

tan(s)+tan(t)/1-tan(s) tan(t)

Q

tan(s-t)

A

tan(s)-tan(t)/1+tan(s) tan(t)

Q

sin(2x)

A

2sinx cosx

Q

cos(2x)

A

cos^2 - sin^2

Q

cos(x/2)

A

+or- rad (1+cosx/2)

Q

sin(x/2)

A

+or- rad(1-cosx/2)

Q

cos((pi/2)-x)

A

sinx