Sum and Difference Formulas - Sine and Cosine

Front

What is the Sum Formula for Cosine?

Back

cos(A + B) = cos(A)cos(B) - sin(A)sin(B)

Front

What is the Difference Formula for Cosine?

Back

cos(A - B) = cos(A)cos(B) + sin(A)sin(B)

Front

What is the Sum Formula for Sine?

Back

sin(A + B) = sin(A)cos(B) + cos(A)sin(B)

Front

What is the Difference Formula for Sine?

Back

sin(A - B) = sin(A)cos(B) - cos(A)sin(B)

Front

How do you express cos(175)cos(55) + sin(175)sin(55) using the cosine of an angle?

Back

cos(175 - 55) = cos(120)

Front

What is the exact value of cos(75°) using Sum or Difference Identities?

Back

√6/4 - √2/4

Front

What is the value of sin(5π/12)cos(π/4) - cos(5π/12)sin(π/4)?

Back

1/2

Front

What is the value of cos(265° - 25°)?

Back

-1/2

Front

What is the exact value of cos(5π/18 - π/9)?

Back

√3/2

Front

What is the relationship between sine and cosine for complementary angles?

Back

sin(90° - θ) = cos(θ) and cos(90° - θ) = sin(θ)