Докажите тождество
[tex]ctg ^{2} \alpha -cos ^{2} \alpha =ctg ^{2} \alpha *cos ^{2} \alpha [/tex]
[tex]ctg ^{2} \alpha -cos ^{2} \alpha =ctg ^{2} \alpha *cos ^{2} \alpha [/tex]
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Сtg²a-cos²a=cos²a/sin²a -cos²a=cos²a(1-sin²a)/sin²a=ctg²a*cos²a