作业帮求最值：（1）y=-2(sin^2)x+2sinx+1 (2)y=[2sinx-1]/[sinx+3]
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求最值：（1）y=-2(sin^2)x+2sinx+1 (2)y=[2sinx-1]/[sinx+3]
求最值：（1）y=-2(sin^2)x+2sinx+1 (2)y=[2sinx-1]/[sinx+3]
求最值：（1）y=-2(sin^2)x+2sinx+1 (2)y=[2sinx-1]/[sinx+3]
y=-2(sin^2)x+2sinx+1=-2(sin^2x-sinx+1/4)+3/2=-2(sinx-1/2)^2+3/2 -1