y = cos x
1
1
π
π
3π
/2
/2
3π
/2
/2
2π
π
2π
π
­1
­1
y = ­sin x
y = cos 2x
1
1
π
π
3π
/2
/2
2π
π
­1
3π
/2
/2
π
2π
­1
y = 2sin x
y = 2/3 sin x
1
π
3π
/2
/2
π
2π
­1
1
y = sin 1/2 x
y = 2sin 1/4 x
y = cos πx
2
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a
3
4
5