Алгебра. 9 класс.
1. Упростите выражение: cos(п-a)tg(п+a)/sin(п/2-a)
2. Вычислите:
A) cos40° cos20°- sin40° sin20°
B) sin105°
3. Упростите выражение:
A) sin2a/2ctga
B) 1-cos2a/1+cos2a​
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