1.

The angle between the curves:y^{2}=4 a x \text { and } a y=2 x^{2}\begin{array}{ll}{\text { (A) } \tan ^{-1} \frac{3}{4}} & {\text { (B) } \tan ^{-1} \frac{3}{5}} \\ {\text { (C) } \tan ^{-1} \frac{4}{3}} & {\text { (D) } \tan ^{-1} \frac{5}{3}}\end{array}

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thank you



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