2×(sinx)^2+3×cosx大于3,求x的取值范围

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2×(sinx)^2+3×cosx大于3,求x的取值范围2×(sinx)^2+3×cosx大于3,求x的取值范围2×(sinx)^2+3×cosx大于3,求x的取值范围2(sinx)^2+3cosx=

2×(sinx)^2+3×cosx大于3,求x的取值范围
2×(sinx)^2+3×cosx大于3,求x的取值范围

2×(sinx)^2+3×cosx大于3,求x的取值范围
2(sinx)^2+3cosx=
=2(1-(cosx)^2)+3cosx=
=-2(cosx)^2+3cosx+2>3
(2cosx-1)(cosx-1)