y=根号3sinxcosx-cos2x的值域是正确题目是:y=根号3sinxcosx-cos²x的值域是
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![y=根号3sinxcosx-cos2x的值域是正确题目是:y=根号3sinxcosx-cos²x的值域是](/uploads/image/z/10137327-15-7.jpg?t=y%3D%E6%A0%B9%E5%8F%B73sinxcosx-cos2x%E7%9A%84%E5%80%BC%E5%9F%9F%E6%98%AF%E6%AD%A3%E7%A1%AE%E9%A2%98%E7%9B%AE%E6%98%AF%EF%BC%9Ay%3D%E6%A0%B9%E5%8F%B73sinxcosx-cos%26%23178%3Bx%E7%9A%84%E5%80%BC%E5%9F%9F%E6%98%AF)
y=根号3sinxcosx-cos2x的值域是正确题目是:y=根号3sinxcosx-cos²x的值域是
y=根号3sinxcosx-cos2x的值域是
正确题目是:y=根号3sinxcosx-cos²x的值域是
y=根号3sinxcosx-cos2x的值域是正确题目是:y=根号3sinxcosx-cos²x的值域是
y=根号3/2sin2x-cos2x
=根号(3/4+1)sin(2x+Q),
=根号7/2sin(2x+Q)
故值域是[-根号7/2,根号7/2]
y=3sinxcosx-cos2x=3/2sin2x-cos2x=√(9/4+1)sin(2x-M),sin的值域是(-1,1),所以y的值域是(-√13/2,√13/2)