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 Homework Statement:
 There is a spaceship moving in the +x direction gets a signal from a source on xy plane. From the reference frame of stable stars, the speed of the spaceship is v and the angle that signal creates between x axis and its direction when reached the spaceship is θ. Get help from lorentz transformations and find out the angle θ in the reference frame of spaceship.
 Relevant Equations:

x'=(xvt)/sqrt(1v^2/c^2)
I didn't use but maybe: t'=(t(vx)/c^2)/sqrt(1v^2/c^2)
That's what I found. But the answer is arctan(sinθ*sqrt(1v^2/c^2)/(cosθ+v/c))
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