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Show that curves ax^2+by^2=1 and cx^2+dy...

Show that curves `ax^2+by^2=1` and `cx^2+dy^2=1` intersect orthogonally if , `1/a-1/b=1/c-1/d`

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CENGAGE PUBLICATION-APPLICATION OF DERIVATIVES-All Questions
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  7. If the tangent at (x1,y1) to the curve x^3+y^3=a^3 meets the curve aga...

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  8. Separate the intervals of monotonocity for the function f(x)=3cos^4x+1...

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