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In a screw jack, the effort required to lift the load is given by. Where W = Load lifted, ? = Helix angle, and ? = Angle of friction

[A].	P = W tan (? ? ?)	[B].	P = W tan (? + ?)
[C].	P = W tan (? - ?)	[D].	P = W tan (? + ?)

Answer: Option B