Ответ:
(1^2-sin^2a)/(1^2-cos^2a)
cos^2a+sin^2a=1
cos^2a/sin^2a=ctg^2a
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Ответ:
(1^2-sin^2a)/(1^2-cos^2a)
cos^2a+sin^2a=1
cos^2a/sin^2a=ctg^2a