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To simplify cos^2θ/1-sinθ, we can make use of the Pythagorean identity cos^2θ = 1 - sin^2θ.
Thus, the expression cos^2θ/1-sinθ becomes (1 - sin^2θ)/(1 - sinθ).
Expanding the numerator, we get 1 - sin^2θ = cos^2θ.
Therefore, the simplified expression is cos^2θ/(1 - sinθ).