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The graphs of y=s in x ,y=cos x , y=t a ...

The graphs of `y=s in x ,y=cos x , y=t a n x& y=cos e c x` drawn on the same axes from `0topi//2` . A vertical one is drawn through the point where the graph of `y=cos x&y=tanx` cross, intersecting the other two graphs at the points `A&B` . The length of the line segment `A B` is `1` b. `(sqrt(5)-1)/2` c. `sqrt(2)` d. `(sqrt(5)+1)/2`

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