The value range of function y = (4-cos ^ x-3sinx) / (2-sinx)

y=(4-cosx-3sinx)/(2-sinx)
2y-2ysinx=4-cosx-3sinx
(2y-3)sinx-cosx=-4
√[(2y-3)²+1]sin(x+a)=-4
sin(x+a)=-4/√[(2y-3)²+1]
|-4/√[(2y-3)²+1]|≤1
(12-√42)/2≤y≤(12+√42)/2
y∈[(12-√42)/2,(12+√42)/2]

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