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f(x)=(sinx)^2+cosx =1-(cosx)^2+cosx =-(cosx)^2+cosx+1 設t=cosx |x|≤π/4√2/2≤t≤1 y=-t^2+t+1 =-(t-1/2)^2+5/4 在[√2/2,1]單調遞減 取最小值時t=1 y=1
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