Question

if x tan alpha+ y tan beta = (x+y) tan (alpha+ beta)/2 . PT: x tan beta= y tan alpha, where alpha nt equal to beta
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Answer 1

Answer:

But if something can travel faster than light, it can travel backward in time, according to the theory. In this case, an "effect" could travel back to a point before its "cause" had occurred — for instance, a baby swinging before he gets a push.