please answer the question
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(x/a) cost+(y/b) sint = 1
squaring on both sides
(x/a)^2 cost^2 +(y/a)^2 sint^2 +2(x-y/ab)sint cost
= 1. .......i
(x/a) sint -(y/b) cost = 1
s.o.b.s.
(x/a)^2 sint^2 +(y/a)^2 cost^2 -2(x-y/ab)sint cost
= 1. .......ii
since sint^2+cost^2 =1
adding i & ii
(x/a)^2 +(y/a)^2 = 2
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