value of cot A is just reciprocal of tanA so find tanA by sin A / cosA = tan A
hypermetropia or farsightedness is an eye defect in one can see the faraway objects clearly but can not see nearby objects. may be due to an increase in focal length or decrease in curvature of the eye lens. it may also occur due to a decrease in the size of the eyeball. here the image is formed the retina.
can be corrected using a convex lens of suitable focal length.
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by th given condition