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Sine and Cosine for Standard Angles
An easy way to remember the values of sine and cosine at the 5 standard angles
in the ﬁrst quadrant:
rounded to
θ
sin(
θ
)
nearest 0
.
1
0
√
0
/
√
4
0
π/
6
√
1
/
√
4
.5
π/
4
√
2
/
√
4
.7
π/
3
√
3
/
√
4
.9
π/
2
√
4
/
√
4
1
rounded to
θ
cos(
θ
)
nearest 0
.
1
0
√
4
/
√
4
1
π/
6
√
3
/
√
4
.9
π/
4
√
2
/
√
4
.7
π/
3
√
1
/
√
4
.5
π/
2
√
0
/
√
4
0
On the next two pages are graphs of sin(
θ
) and cos(
θ
) for standard angles
θ
in [0
,
2
π
].
Rounded values of these functions are given on page 2. For the purpose of sketching graphs
of polar equations, we generally do not require more precision than is given by real numbers
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This note was uploaded on 02/17/2012 for the course MTH 133 taught by Professor Staff during the Fall '08 term at Michigan State University.
 Fall '08
 STAFF
 Calculus, Angles

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