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4.07 Further definite integrals

Worksheet
Definite integrals
1

Calculate the following definite integrals:

a

\int_{ - 4 }^{2} e^{x} dx

b

\int_{0}^{3} e^{ 4 x} dx

c

\int_{0}^{2} e^{ \frac{3}{2} x} dx

d

\int_{ - 2 }^{4} e^{ 3 x} dx

e

\int_{ - 3 }^{5} e^{ - 2 x } dx

f

\int_{0}^{2} \left(7 + e^{x}\right) dx

g

\int_{0}^{3} \left( 2 e^{ 5 x} + e^{ - 7 x }\right) dx

h

\int_{ - 3 }^{3} \left(e^{ \frac{1}{4} \theta} - 3 e^{ - 0.2 \theta }\right) d\theta

i

\int_{3}^{4} \left(e^{ 2 x} + 4\right)^{2} dx

j

\int_{ - 4 }^{4} \left(e^{x} + e^{ 2 x}\right)^{2} dx

k

\int_{ - 4 }^{3} \dfrac{e^{ - 2 x} + e^{ 3 x}}{e^{x}} dx

l

\int_{1}^{16} \left(e^{ 4 x} + x^{2} - \sqrt{x}\right) dx

2

Calculate the following definite integrals:

a

\int_{\frac{3 \pi}{2}}^{ 2 \pi} \cos x \ dx

b

\int_{\frac{\pi}{2}}^{\pi} \left( - \sin x \right) dx

c

\int_{\frac{\pi}{6}}^{\frac{7 \pi}{6}} 2 \sin x \ dx

d

\int_{\frac{\pi}{6}}^{\frac{7 \pi}{6}} 2 \cos x \ dx

e

\int_{ - \frac{\pi}{6} }^{\frac{7 \pi}{6}} \sin 3 x \ dx

f

\int_{ - \frac{\pi}{6} }^{\frac{7 \pi}{6}} \cos 3 x \ dx

g

\int_{ - \frac{2 \pi}{3} }^{ 2 \pi} \sin \left(\dfrac{x}{4}\right) dx

h

\int_{ - \frac{4 \pi}{3} }^{\frac{2 \pi}{3}} \cos \left(\dfrac{x}{4}\right) dx

i

\int_{ - 6 }^{9} \sin \left(\dfrac{\pi x}{3}\right) dx

j

\int_{ - 8 }^{4} \cos \left(\dfrac{\pi x}{2}\right) dx

k

\int_{\frac{\pi}{4}}^{\frac{\pi}{3}} \sin \left(x + \pi\right) dx

l

\int_{ - \frac{\pi}{2} }^{\pi} \cos \left( 4 x - \dfrac{\pi}{2}\right) dx

m

\int_{0}^{\frac{\pi}{6}} \left(\sin x + \cos x\right) dx

n

\int_{ - \frac{\pi}{6} }^{\frac{\pi}{6}} \left( 4 \cos x + \cos 4 x\right) dx

o

\int_{ - \pi }^{\pi} \left(\sin \left(\dfrac{\theta}{6}\right) - \cos \left(\dfrac{\theta}{6}\right)\right) d\theta

p

\int_{0}^{\frac{\pi}{3}} \left( 2 \cos 3 x + \dfrac{1}{4} \sin 2 x\right) dx

q

\int_{ - \frac{\pi}{2} }^{\frac{\pi}{2}} \left( 8 \cos \left( 2 x\right) - 9 \sin \left( 3 x\right)\right) dx

3

Consider the function y = e^{x} + e^{ - x }.

a

Find y'.

b

Find the exact value of \int_{0}^{3} \dfrac{e^{x} - e^{ - x }}{e^{x} + e^{ - x }} dx.

4

Consider the function y = e^{ 3 x} \left(x - \dfrac{1}{3}\right).

a

Find y'.

b

Hence find the exact value of \int_{6}^{9} x e^{ 3 x} dx.

Graph symmetry
5

Calculate the exact area of the region enclosed between the following:

a

y = e^{ 4 x}, the x-axis, and the lines \\ x = -1 and x=2.

b

y = e^{x}, the coordinate axes and the line x = 2.

c

y = - e^{x}, the coordinate axes and the line x = 5.

d

y = e^{x} + 4, the coordinate axes and the line x = 4.

e

y = e^{ - 6 x}, the x-axis, the lines x = - 2 and x = 1.

f

y = 6 e^{ 3 x}, the x-axis, the lines x = - 3 and x=3.

g

y = e^{\frac{x}{4}} + e^{ - \frac{x}{4} }, the coordinate axes and the line x = \dfrac{1}{2}.

6

Calculate the exact area of the regions bounded by the x-axis and the curve:

a

y = 3 \sin x, from x=0 and x=\pi.

b

y = \cos 3 x, from x=0 to x=\dfrac{\pi}{3}.

c

y = \sin 2 x, from x = \dfrac{\pi}{4} to x = \dfrac{3 \pi}{4}.

d

y = 3 \sin x, from x=0 to x=2\pi.

e

y = \sin x, from x = 0 to x = \dfrac{\pi}{2}.

f

y = 3 \cos x, from x = 0 to x = \dfrac{\pi}{2}.

g

y = \cos x, from x = 0 to x = 2 \pi.

h

y = 3 \left(\sin x + 1\right), from x = 0 to x = 2 \pi.

i

y = \dfrac{1}{3} + 3 \cos x, from x = - \dfrac{\pi}{6} to x = \dfrac{\pi}{6}.

j

y = 2 + \dfrac{1}{4} \sin 2 x, from x = 0 to x = \dfrac{\pi}{2}.

k

y = 8 \cos 2 x + 4 \sin 2 x, from x = 0 to x = \dfrac{\pi}{8}.

7

Consider the function f \left( x \right) = e^{ 3 x} - e^{ - 3 x }.

a

Find the x-intercept(s) of the function.

b

State the limiting function as x approaches +\infty.

c

Determine whether the function is odd or even.

d

Find the exact area enclosed between the curve, the coordinate axes, and the line x = 3.

e

Find the exact area bound by the curve, the x-axis, and the lines x = 1 and x = - 1.

8

Consider the integral \int_{ - \frac{\pi}{12} }^{\frac{\pi}{12}} \sin 4 x \ dx.

a

Evaluate the definite integral.

b

State the values of x on the domain - \dfrac{\pi}{12} \leq x \leq \dfrac{\pi}{12} , for where the curve y= \sin 4x is:

i

Above the x-axis

ii

Below the x-axis

c

Hence calculate the exact area bound by the curve y= \sin 4x, the x-axis, and the lines x = - \dfrac{\pi}{12} and x = \dfrac{\pi}{12} .

9

Consider the curve y = \cos \left(\dfrac{x}{4}\right).

a

Find the area bound by the curve and the axes, between x = 0 and x = \dfrac{\pi}{2}.

b

Hence find the area bound by the curve and the x-axis, between x = - 4 \pi and x = 4 \pi.

10

Consider the curve y = 4 \sin \left(\dfrac{\pi x}{5}\right).

a

State the period of the curve.

b

Find the exact area bounded by the curve and the x-axis, between x = \dfrac{5}{4} and x = \dfrac{5}{2}.

11

Consider the curve y = \sin 3 x.

a

Graph the function on the domain 0 \leq x \leq 2 \pi.

b

Find the exact area of the region bounded by the curve, the x-axis and the lines x = 0 and x= \dfrac{\pi}{4}.

12

Consider the curve y = 3 \sin 2 x.

a

Graph the function on the domain 0 \leq x \leq 2 \pi.

b

Find the exact area bound by the curve and the x-axis between:

i

x = 0 and x = \dfrac{\pi}{2}

ii

x = \dfrac{\pi}{4} and x = \dfrac{2 \pi}{3}

13

Consider the function y = 2 - \cos x.

a

Graph the function on the domain 0 \leq x \leq 2 \pi.

b

Hence find the area represented by the integral \int_{0}^{\frac{\pi}{2}} \left(2 - \cos x\right) dx.

Use technology
14

Use technology to evaluate \int_{ - 1 }^{4} \dfrac{e^{x}}{\sqrt{x + 4}} \ dx. Round your answer to two decimal places.

15

Use technology to calculate the area bounded by the curve y = e^{ 2 x} \cos 3 x, the x-axis, and the lines x = - \dfrac{\pi}{2} and x = \dfrac{\pi}{6}. Round your answer to two decimal places.

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Outcomes

3.2.12

interpret the definite integral ∫ {from a to b} f(x)dx as area under the curve y=f(x) if f(x)>0

3.2.13

interpret ∫ {from a to b} f(x)dx as a sum of signed areas

3.2.14

apply the additivity and linearity of definite integrals

3.2.17

develop the formula ∫ {from a to b} f(x)dx= F(b)−F(a) and use it to calculate definite integrals

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