Question: If a plane surface inclined at angle moves horizontally, the angle for which the lifting force of the air is a maximum is found

If a plane surface inclined at angle θ moves horizontally, the angle for which the lifting force of the air is a maximum is found by solving the equation 2sin θ cos² θ − sin³ θ = 0, where 0 < θ < 90°. Solve for θ.

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