ПОЖАЛУЙСТА ПОМОГИТЕ МНЕ C ТРИГОНОМЕТРИЕЙ,УМОЛЯЮЮЮЮ((((
1. -SIN^2X-COS^2X*COS^2X/COS^2X
2. SIN^4X+SIN^2X*COS^2X/COS^2X
3. 1+CTG^2X/CTG^2
4. TG^2X/1+TG^2X
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