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If cottheta+tantheta=x and sectheta-cost...

If `cottheta+tantheta=x and sectheta-costheta=y` then (i) `sintheta costheta=-x` (ii)`sintheta tantheta=-y` (iii) `(x^2y)^(2/3)-(xy^2)^(2/3)=1` (iv) `(x^2y)^(1/3)+(xy^2)^(1/3)=1`

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