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A2C 8-64 HW eTool
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c. A negative cosine and a negative sine.
c. A negative cosine and a negative sine.
5
d. A cosine of about −0.9 and a sine of about 0.4.
d. A cosine of about −0.9 and a sine of about 0.4.
6
e. Could an angle have a sine equal to 0.9 and cosine equal to 0.8? Give an angle or explain why not.
e. Could an angle have a sine equal to 0.9 and cosine equal to 0.8? Give an angle or explain why not.
7
HINT: Given a particular angle in the unit circle, the height and base lengths shown indicated at right. Drag the slider below to change the angle.
HINT: Given a particular angle in the unit circle, the height and base lengths shown indicated at right. Drag the slider below to change the angle.
8
Expression 9: "a" equals 30
a
=
3
0
0
0
360
3
6
0
9
10
powered by
powered by
0.5
0.866
30º
"x"
x
"y"
y
"a" squared
a
2
"a" Superscript, "b" , Baseline
a
b
7
7
8
8
9
9
over
÷
functions
(
(
)
)
less than
<
greater than
>
4
4
5
5
6
6
times
×
| "a" |
|
a
|
,
,
less than or equal to
≤
greater than or equal to
≥
1
1
2
2
3
3
negative
−
A B C
StartRoot, , EndRoot
pi
π
0
0
.
.
equals
=
positive
+
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