Understanding Derivatives and Trigonometric Functions

The video tutorial explains how to find the derivative of the function f(x) = 2cos(x) - 3csc(x) and evaluate it at x = 2π/3. It begins by deriving the function, then uses reference triangles to find trigonometric values for substitution. The derivative is simplified, and the slope of the tangent line at the given point is calculated. The tutorial concludes with a graph analysis to visualize the slope.

What is the initial function given in the problem?

• f(x) = 2sin(x) - 3sec(x)

• f(x) = 2cos(x) - 3csc(x)

• f(x) = 2tan(x) - 3cot(x)

• f(x) = 2csc(x) - 3cos(x)

What is the derivative of cosine x?

• cosine x

• -sine x

• -cosine x

• sine x

What is the derivative of cosecant x?

• -cosecant x cotangent x

• cosecant x tangent x

• cosecant x cotangent x

• -cosecant x sine x

What is the reference angle for 2π/3 radians?

• 90 degrees

• 45 degrees

• 30 degrees

• 60 degrees

In which quadrant is the angle 2π/3 located?

• Fourth quadrant

• Third quadrant

• Second quadrant

• First quadrant

What is the sine of 2π/3?

• 1/2

• √3/2

• -1/2

• -√3/2

What is the cosecant of 2π/3?

• -2/√3

• -√3/2

• 2/√3

• √3/2

What is the cotangent of 2π/3?

• 1/√3

• -1/√3

• -√3

• √3

What is the simplified value of f'(2π/3)?

• 2√3

• -√3 - 2

• -2√3

• √3 + 2

What is the approximate decimal value of the slope of the tangent line at x = 2π/3?

• -3.732

• 3.732

• -2.732

• 2.732