Sum & Diff and Double of sin, cos & tan

What is the double angle formula for cosine?

• @@ ext{cos}(2A) = 2 ext{cos}^2(A) - 1@@

• @@ ext{cos}(2A) = ext{cos}^2(A) - ext{sin}^2(A)@@

• @@ ext{cos}(2A) = 1 - 2 ext{sin}^2(A)@@

• @@ ext{cos}(2A) = 2 ext{sin}^2(A) - 1@@

What is the Pythagorean identity for sine and cosine?

• @@ ext{sin}^2(A) + ext{cos}^2(A) = 1@@

• @@ ext{sin}(A) + ext{cos}(A) = 1@@

• @@ ext{sin}^2(A) - ext{cos}^2(A) = 1@@

• @@ ext{sin}^2(A) + ext{cos}^2(A) = 0@@

What is the value of @@\text{cos}(0)@@?

• 0

• 0.5

• 1

• -1

What is the difference formula for tangent?

• @@ ext{tan}(A - B) = rac{ ext{tan}(A) - ext{tan}(B)}{1 + ext{tan}(A) ext{tan}(B)}@@

• @@ ext{tan}(A - B) = rac{ ext{tan}(A) + ext{tan}(B)}{1 - ext{tan}(A) ext{tan}(B)}@@

• @@ ext{tan}(A - B) = ext{tan}(A) - ext{tan}(B)@@

• @@ ext{tan}(A - B) = rac{ ext{tan}(A) imes ext{tan}(B)}{1 + ext{tan}(A) + ext{tan}(B)}@@

What is the double angle formula for tangent?

• @@ ext{tan}(2A)=rac{2 an A}{1- an^2A}@@

• @@ ext{tan}(2A)=rac{ an A + an A}{1 - an A an A}@@

• @@ ext{tan}(2A)=rac{ an A - an A}{1 + an A an A}@@

• @@ ext{tan}(2A)=rac{2 an A}{1+ an^2A}@@

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

• @@ ext{sin}(A) = ext{cos}(90 - A)@@

• @@ ext{sin}(A) = ext{sin}(90 - A)@@

• @@ ext{cos}(A) = ext{sin}(90 - A)@@

• @@ ext{cos}(A) = ext{cos}(90 - A)@@

What is the relationship between cotangent and sine/cosine?

• @@ ext{cot}(A)=rac{ ext{cos}(A)}{ ext{sin}(A)}@@

• @@ ext{cot}(A)=rac{ ext{sin}(A)}{ ext{cos}(A)}@@

• @@ ext{cot}(A)= ext{sin}(A) + ext{cos}(A)@@

• @@ ext{cot}(A)= ext{sin}(A) - ext{cos}(A)@@

What is the relationship between tangent and sine/cosine?

• The tangent function is defined as: @@\text{tan}(A) = \frac{\text{sin}(A)}{\text{cos}(A)}@@.

• The tangent function is the sum of sine and cosine.

• The tangent function is the product of sine and cosine.

• The tangent function is defined as: @@\text{tan}(A) = \text{sin}(A) + \text{cos}(A)@@.

What is the sum formula for cosine?

• @@ ext{cos}(A + B) = ext{cos}(A) ext{cos}(B) + ext{sin}(A) ext{sin}(B)@@

• @@ ext{cos}(A + B) = ext{cos}(A) ext{cos}(B) - ext{sin}(A) ext{sin}(B)@@

• @@ ext{cos}(A + B) = ext{cos}(A) + ext{cos}(B)@@

• @@ ext{cos}(A + B) = ext{sin}(A) ext{sin}(B) - ext{cos}(A) ext{cos}(B)@@