September 2021 0 13 Report
Помогите пожалуйста с Алгеброй. (1-tg^2t)cos^2t
Докажите тождества
1-sinα=2sin^2(45°-α/2)

sin^2(3π/4+2t)=1-sin4t/2
p.s / знак дроби
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