Упражнения 29.1. Упростите тригонометрическое выражение: cos(a - )- sin(a); 1) 2 2 (2) 8tg945 + tg(810° + a)- ctg(450'-a); (3) sin(20-n) + 2 cos(a + 3r) sin(a - ³*); 2 2 4) sin(a + r) + tg(α-n); ​
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