Complete the following questions before our next lesson.

Exercise 18A questions 1dhlno, 2bce, 3bfg, 4bd, 5

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# Month: April 2018

## 11 HL Derivatives of Functions

## 11 HL Working with Derivatives

## 11 SL Double-Angle Formulas

## 11 SL Trigonometric Identities and Expressions

## 11 HL Limits

## 11 SL Trigonometric Equations and Models

## 11 SL Solving Trigonometric Equations

## 11 SL Trigonometric Models Review

## 11 SL Modelling with Trigonometric Functions Part 2

## 11 SL Modelling with Trigonometric Functions

Complete the following questions before our next lesson.

Exercise 18A questions 1dhlno, 2bce, 3bfg, 4bd, 5

Following on from our discussion from class, complete the following question.

Let \(f(x)=\frac{1}{3}x^3-2x^2\). Find the coordinates of the local maximum and the local minimum of \(f\).

Are you interested in seeing something else that’s sort of neat? Read on.

We’ll eventually be discussing something called the *second derivative*. Once you’ve found the derivative of a given function, you can then go on to find the derivative of *that derivative*. For example, if \(f(x)=2x^5\), then \(f'(x)=10x^4\). The second derivative is represented as \(f^{\prime \prime}(x)\); in this case, we have \(f^{\prime \prime}(x)=40x^3\).

Find the second derivative of the function \(f(x)=\frac{1}{3}x^3-2x^2\), then solve the equation \(f^{\prime \prime}(x)=0\). On the graph of \(f\), plot the point on \(f\) whose \(x\)-coordinate is the solution you found to \(f^{\prime \prime}(x)=0\). What do you notice about the location of this point?

Complete the questions below (which will be good preparation for our test on Friday).

Exercise 11D questions 7gjm, 8a, 9a, 10b

Exercise 11E 1de, 2ade

In order to make use of the trigonometric identities we discussed today, it is frequently also necessary to be able to simplify or factor expressions involving trigonometric functions.

The questions below give you some opportunity to practice simplifying and factoring, then you’ll use those skills when applying the double-angle formulae. Complete these questions before our next class (and these may be checked on Monday…).

Exercise 11C.1 questions 1aef, 2d, 3acd, 4ad

Exercise 11C.2 questions 1ace, 2af, 3af

Exercise 11D questions 1–5

Complete the following before our next class.

Exercise 17A questions 1, 2c, 3, 5ai

Exercise 17B.1 question 2

Exercise 17B.2 question 1

Now that we’ve covered some techniques for solving trigonometric equations, we can make use of those techniques in situations involving trigonometric models. Complete the questions below before our next class.

Exercise 11B questions 3, 5, and 6

Try your best to complete the following questions for our next class. (Some of these will be more difficult than what we considered in class, so do your best to find answers on your own and we’ll look at the more difficult questions on Monday.)

Exercise 11A.2 questions 2ab, 4

Exercise 11A.3 questions 1, 2, 5, 6efg, 7

We’ve now finished the chapter on modelling with trigonometric functions, and the questions listed below will help you review this material. We’ll begin our next class with a discussion of the solutions, then we’ll begin looking at the next (and final) chapter on trigonometry.

Review Set 10A questions 3–6

Review Set 10B questions 2–5

Review Set 10C questions 3 and 6

Now that we’ve built our London Eye model, we can use the same technique (applying our knowledge of transformations) to model other situations that involve periodic behaviour (and to answer more general questions about transformations involving trigonometric functions).

Read the (brief) section at the top of page 242 about the “general” sine function, then get a good start on the following questions before our next class (tomorrow).

Exercise 10B.1 questions 3 and 4

Exercise 10C questions 4 and 5 (for more of a challenge, try question 1)

Exercise 10F question 1

Now that we’ve learned about the graphs of trigonometric functions, we can apply our understanding of transformations of functions to transform trigonometric functions (particularly sine and cosine) to model period behaviour, like the tides, temperature, etc.

Try to complete the following questions before our next lesson (I suggest leaving the horizontal stretch until the end).

The London Eye is 15 m off the ground, and has a diameter of 120 m. The London Eye completes one revolution every 30 minutes.

- Develop a function to model the height of a passenger on the London Eye
*t*minutes after boarding a capsule. -
How far above ground would passengers in a capsule be after

a. 10 minutes have passed?

b. 25 minutes have passed?