[" 175.If "x cos theta+y sin theta=sqrt(...

[" 175.If "x cos theta+y sin theta=sqrt(x^(2)+y^(2))" and "],[qquad (cos^(2)theta)/(a^(2))+(sin^(2)theta)/(b^(2))=(1)/(x^(2)+y^(2))" then the correct relation is "]

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