Let f(x)=ab sin x+bsqrt(1-a^(2))cosx+c, ...

Let `f(x)=ab sin x+bsqrt(1-a^(2))cosx+c`, where `|a|lt1,bgt0` then

maximum value of f(x) is b, if c = 0

difference of maximum and minimum value of f(x) is 2b

`f(x)=c, if x=-cos^(-1)a`

`f(x)=c, if x=cos^(-1)a`

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