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Sine sum identity: sin (x + y) = (sin x)(cos y) + (cos x)(sin y)

Sine difference identity: sin (x - y) = (sin x)(cos y) - (cos x)(sin y)

Cosine sum identity: cos (x + y) = (cos x)(cos y) - (sin x)(sin y)

Cosine difference identity: cos (x - y) = (cos x)(cos y) + (sin x)(sin y)

Tangent sum identity: tan (x + y) = [(tan x) + (tan y)]/[1 - (tan x)(tan y)]

Tangent difference identity: tan (x - y) = [(tan x) - (tan y)]/[1 + (tan x)(tan y)]

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Q: What are the sum and difference identities for the sine cosine and tangent functions?

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They are different trigonometric functions!

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