Correct Answer: Option C

Explanation

√5 cosx + √15sinx = 0;

√5 (cosx + √3sinx) = 0

cosx = -sinx√3;  \(\frac{sinx}{cos}\) = \(\frac{-1}{√3}\)

tanx =  \(\frac{-1}{√3}\);  x = 150° or 330°

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