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What is the angle with respect to north made by the velocity vector of the two cars after the collision?

Express your answer in terms of . Your answer should contain an inverse trigonometric function.

I have already tried tan(theta)=cos(phi)/(2-sin(phi)) and arctan(cos(phi)/(2-sin(phi)) and tan(cos(phi)/(2-sin(phi)) but none seem to be the right answer

someone help please!