What is the formula to find out the angle of taper?

1
Tan α\(\rm \frac{d-D}{2xl}\)
2
Tan α = \(\rm \frac{d-D}{l}\)
3
Tan α = \(\rm \frac{D-d}{2l}\)
4
Tan α = \(\rm \frac{D-d}{l}\)

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