f(x)=cos-12xx+1
-1≤2xx+1≤1⇒2xx+1≤1⇒2x≤x+1⇒x≤1
-1≤2xx+1⇒-x-1≤2x⇒3x≥-1⇒x≥-13
অতএব, ডোমেন =x:-13≤x≤1=-13,1;
রেঞ্জ =cos-12×11+1,cos-12-13-13+1=0,π
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