July 2022 1 14 Report
Допоможіть будь ласка буду дуже вдячна
1)Спростіть вираз sin 5a×cos a - sin a×cos 5a.
2)Знайдіть tg2a,якщо tga=3.
3)Обчисліть:cos 3π÷2+ctg 7π÷6.
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