Докажите тождество В)(〖cos〗^2 α-〖sin〗^2 α)/(〖ctg〗^2 α-〖tg〗^2 α)=〖sin〗^2 α ∙〖cos〗^2 α Г )(1-4〖sin〗^2 α 〖cos〗^2)/〖( sin⁡〖α+cos⁡〖α)〗 〗〗^2 +2sinα cos α=1
помогите пожалуйста срочно
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