Question 1106749
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To eliminate the parameter in this problem, use the identity {{{cos^2(a)}}} + {{{sin^2(a)}}} = 1,  which will give you


{{{(x/4)^2}}} + {{{(5y/3)^2}}} = 1,   or


{{{x^2/16}}} + {{{25y^2/9}}} = 1.


Now identify it with one of four your options.
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