Sum and Difference Identities

Front

What are the Sum and Difference Identities for sine?

Back

sin(a ± b) = sin(a)cos(b) ± cos(a)sin(b)

Front

What are the Sum and Difference Identities for cosine?

Back

cos(a ± b) = cos(a)cos(b) ∓ sin(a)sin(b)

Front

What is the Sum Identity for tangent?

Back

tan(a + b) = (tan(a) + tan(b)) / (1 - tan(a)tan(b))

Front

What is the Difference Identity for tangent?

Back

tan(a - b) = (tan(a) - tan(b)) / (1 + tan(a)tan(b))

Front

Find the exact value of sin(5π/12)cos(π/4) - cos(5π/12)sin(π/4).

Back

1/2

Front

Write cos(175)cos(55) + sin(175)sin(55) as a single cosine function.

Back

cos(120)

Front

Use Sum or Difference Identities to find the exact value of cos(75°).

Back

√6/4 - √2/4

Front

What is the value of sin(30°)?

Back

1/2

Front

What is the value of cos(60°)?

Back

1/2

Front

What is the value of tan(45°)?

Back

1