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If (a-b cos y) (a + b cos x)= a^(2) -b^(...

If `(a-b cos y) (a + b cos x)= a^(2) -b^(2)` show that `(dy)/(dx)= (sqrt(a^(2)-b^(2)))/(a+b cos x), 0 lt x lt (pi)/(2)`

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