упростить:
1. sin(п/2-a)-sin(п-a)-cos(п-a)-sin(2п-a)
2. sin (a+ П/2) - sin (a - П/2) + 3cosa - 3cos (2П-a)
3. sin^2 (П-х) + tg^2 (П-х) * tg^2 (3П/2+x) - sin (П/2 + x)* cos (x-2П)
 
a - альфа
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