TRIGONOMETRI

What is the Pythagorean identity in trigonometry?

• sin²α + cos²α = 1

• sin²α - cos²α = 1

• sinα + cosα = 1

• sinα - cosα = 1

Which identity expresses the relationship between trigonometric functions of complementary angles?

• Co-function identities

• Pythagorean identities

• Even-odd identities

• Symmetry identities

How can the equation sin x = sin α be solved?

• x = α + k.360° or x = (180° – α) + k.360°

• x = α + k.180° or x = (90° – α) + k.180°

• x = α + k.90° or x = (270° – α) + k.90°

• x = α + k.45° or x = (135° – α) + k.45°

What is the general form of a model used in trigonometry to represent periodic phenomena like sound waves?

• S = A cos(ωt)

• S = A sin(ωt)

• S = A tan(ωt)

• S = A cot(ωt)

In solving the equation 2sin²(2x) – 7 sin 2x + 3 = 0, what substitution is used?

• sin 2x = p

• cos 2x = p

• tan 2x = p

• cot 2x = p