Помогите пожалуйста срочно

Question

Помогите пожалуйста срочно

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Answer 1

1 - sin(180° - α)*cos(180° - α)*tg(180° - α) =

= 1 - sin(180° - α)*cos(180° - α)*(sin(180° - α)/cos(180° - α)) =

Сокращаем cos(180° - α).

= 1 - sin^2(180° - α) = cos^2(180° - α)* = (-cosα)^2 = cos^2 α.