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Uprość wyrażenie.

\frac{(1-cos\alpha)(1+cos\alpha)}{(1-sin\alpha)(1+sin\alpha)}

(cos\alpha\cdot tg\alpha\cdot sin\alpha\cdot ctg\alpha)^{2}

tg\alpha+\frac{cos\alpha}{1+sin\alpha}

(sin\alpha+cos\alpha)^{2}+(cos\alpha-sin\alpha)^{2}


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