Mathematics Differential Calculus Applications of Derivatives

What is the maximum value of a cos x + b sin x + c? 

1
\(\rm \sqrt{a^2+b^2+c}\)
2
\(\rm \sqrt{a^2+b^2}+c\)
3
\(\rm \sqrt{a^2+b^2}-c\)
4
\(\rm \sqrt{a^2+b^2}\)

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