cos(2x+)=1/2
y=2sinα+1 −1≤sinα≤1 −2≤2sinα≤2 −1≤2sinα+1≤3 Zw=<−1,3>
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y=2sin(2x+
)+1
3 π
2x+
=α
3
y=2sinα+1 −1≤sinα≤1 −2≤2sinα≤2 −1≤2sinα+1≤3 Zw=<−1,3>