$(a)\;\large\frac{1+ sin \alpha}{1-sin \alpha} \qquad(b)\;\large\frac{1+ cos \alpha}{1-cos \alpha} \qquad(c)\;\large\frac{1+ tan \alpha}{1-tan \alpha} \qquad(d)\;\large\frac{1+ sin \alpha}{1-cos \alpha} $

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