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A two metre long object is fired vertica...

A two metre long object is fired vertically upwards from the mid point of two locations A and B, 8m apart. The speed of the object after t second is given by `(ds)/(dt)=2t+1m/s`. Let `alpha and beta` be theangle subtended by the object at A and B, respectively after one and two seconds. Find the value `cos(alpha-beta)`

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