\(\zeta\) \(\eta\) day

Level pending

If the lag angle in a helicopter(\(\zeta\)) is given to be 30, and Krish applied a force parallel to an inclined friction less plane where the inclination is just because of \(\zeta\) with the horizontal, then \(\eta\) of the helicopter's blade due to the Krish's force is?

Details : Angle measured in degrees. Use your mind what can be\(\eta\) is?

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