Graph the 11st function, y=cos2xy=cos2x. It is better to divide the value of its period into 44 parts and have the curve meet the following conditions:
Curve starts at (0,1)(0,1)
Curve intercepts x-axis at 1st quarter
Curve reaches minimum amplitude (a=1a=1) at 2nd quarter
Curve intercepts x-axis at 3rd quarter
Curve starts again at the period (π,1π,1)
Hence, this will be the curve for y=cos2xy=cos2x under the domain 0≤x≤π0≤x≤π
Now, graph the 22nd function
Convert the current labels in the graph into decimal form and insert whole numbers accordingly
Set up a grid of xx and yy values to help with the graphing
Substitute each xx value to function to solve for the corresponding yy value
xx
00
11
22
yy
yy
==
x2x2
==
0202
Substitute x=0x=0
==
00
xx
00
11
22
yy
00
yy
==
x2x2
==
1212
Substitute x=1x=1
xx
00
11
22
yy
00
1212
yy
==
x2x2
==
2222
Substitute x=2x=2
==
11
xx
00
11
22
yy
00
1212
11
Plot the 33 points on the updated graph
Finally, connect the 33 dots to form a line
Question 4 of 4
4. Question
Graph the following trigonometric functions within the domain -2π≤x≤2π−2π≤x≤2π
Graph the 11st function, y=2sinxy=2sinx. It is better to divide the value of its period into 44 parts and have the curve meet the following conditions:
Curve starts at (0,0)(0,0)
Curve reaches peak of amplitude (a=2a=2) at 1st quarter
Curve intercepts x-axis at 2nd quarter
Curve reaches minimum amplitude at 3rd quarter
Curve starts at x-axis again at the period (P=2πP=2π)
Since the domain is -2π≤x≤2π−2π≤x≤2π, copy this curve into the left side of the yy-axis
Hence, this will be the curve for y=2sinxy=2sinx under the domain -2π≤x≤2π−2π≤x≤2π
Lastly, graph the 22nd function, y=-2sinxy=−2sinx. Again, divide the value of its period into 44 parts and have the curve meet the following conditions:
Curve starts at (0,0)(0,0)
Curve reaches peak of amplitude (a=-2a=−2) at 1st quarter
Curve intercepts x-axis at 2nd quarter
Curve reaches minimum amplitude at 3rd quarter
Curve starts at x-axis again at the period (P=2πP=2π)
Since the domain is -2π≤x≤2π−2π≤x≤2π, copy this curve into the left side of the yy-axis
Therefore, this will be the curve for the functions y=2sinxy=2sinx and y=-2sinxy=−2sinx under the domain -2π≤x≤2π−2π≤x≤2π