Cambridge Additional Mathematics

y

x

123456789101112131415

1

0.5

-0.5

-1

yy y=sin2x

11 22 33 44 55 66 77 88 99 1010 1111 1212 1313 1414 1515 xx

11

0.50.5

-1-1

y=y=sinsin2x2x

OO

-0.5-0.5

-0.5

y

x

123456789101112131415

1

0.5

-1

y=sinx

y

x

123456789101112131415

0.5

-0.5

-1

(^1) y=cosx
-0.5-0.5
yy
11 22 33 44 55 66 77 88 99 1010 1111 1212 1313 1414 1515 xx
11
0.50.5
-1-1
y=y=sinsinxx
OO
yy
11 22 33 44 55 66 77 99 1010 1212 1313 1414 1515 xx
-0.5-0.5
-1-1
y=y=coscosxx
OO
0.50.5
11
88 1111
242 Trigonometric functions (Chapter 9)

EXERCISE 9E.1

1

Use the graph of y= sinx to find, correct to 1 decimal place, the solutions of:

a sinx=0: 3 for 06 x 615 b sinx=¡ 0 : 4 for 56 x 615.

2

Use the graph of y= cosx to find, correct to 1 decimal place, the solutions of:

a cosx=0: 6 for 06 x 610 b cosx=¡ 0 : 3 for 46 x 612.

3

Use the graph of y= sin 2x to find, correct to 1 decimal place, the solutions of:

a sin 2x=0: 7 for 06 x 616 b sin 2x=¡ 0 : 3 for 06 x 616.

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Additional Mathematics
Y:\HAESE\CAM4037\CamAdd_09\242CamAdd_09.cdr Tuesday, 28 January 2014 9:40:33 AM BRIAN