A maximum value of \( a \cos \theta+b \sin \theta \) is \( (a0, b0) \) (a) \( a+b \) (b) \( a-b ...

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A maximum value of \( a \cos \theta+b \sin \theta \) is \( (a0, b0) \)
(a) \( a+b \)
(b) \( a-b \)
(c) \( |a|+|b| \)
(d) \( \sqrt{a^{2}+b^{2}} \)
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