The video tutorial covers the auxiliary angle form in trigonometry, focusing on cosine expansions and the importance of positive amplitude. It explains how to compare coefficients and select the correct form for trigonometric expressions. The tutorial also addresses handling incorrect forms and the implications of phase shifts.

What is the natural form chosen for expressing y in terms of cosine?

• r sin(x - alpha)

• r tan(x + alpha)

• r cos(x - alpha)

• r sin(x + alpha)

When expanding the expression, what is the first step after choosing the form?

• Solve for x

• Integrate the function

• Differentiate the expression

• Expand the right-hand side

Why is the amplitude represented by r always positive?

• Because it represents a speed

• Because it represents a negative value

• Because it represents a quantity and amplitude

• Because it represents a weight

What is the relationship between sine and cosine that allows conversion between them?

• Sine is the derivative of cosine

• Cosine is the integral of sine

• Cosine is the complement of sine

• Sine is the complement of cosine

What happens when you choose a negative value for r?

• It has no effect on the result

• It makes the angle obtuse

• It results in a different phase shift

• It simplifies the calculation

What is the main challenge when using the wrong form for wave functions?

• It results in a larger amplitude

• It simplifies the process

• It requires additional steps to match expected results

• It makes the angle acute

How can you adjust the phase shift when using a different form?

• By multiplying by a constant

• By changing the amplitude

• By adding or subtracting pi

• By using a different trigonometric function

What is the equivalent expression for root three cos x plus sine x using the wrong form?

• Two sin(x - pi/3)

• Two cos(x - pi/3)

• Two sin(x + pi/3)

• Two cos(x + pi/3)

What is the exact value of the angle when cos alpha is one on two?

• 30 degrees

• 90 degrees

• 45 degrees

• 60 degrees

What is the formula used to calculate r in terms of a and b?

• r = a + b

• r = a * b

• r = a - b

• r = sqrt(a^2 + b^2)