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TG T +1/1+CTG T. Упростите cos t *CTG T *sin t. Тождество TG CTG sin. Докажите тождество TGT/TGT+ctgt cos2t.
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TG T +1/1+CTG T. Упростите cos t *CTG T *sin t. Тождество TG CTG sin. Докажите тождество TGT/TGT+ctgt cos2t.