Hi

4 cos 210 degrees + 3 tan 330 degrees 

 4(-sqrt(3)/2) + 3((-1/2)/(sqrt(3)/2)

  -2sqrt(3) - 3/sqrt(3)= -2sqrt(3) - 3sqrt(3)/3 = -3sqrt(3)

Thought this (cosx, sinx) summary may be helpful to You.

 

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