17. Визначте знак добутку:

a) cos 30°•sin 15°• cos 125°•tg 35°; 6) sin 137°• cos 150º•tg 22°• cos 35°; B) tg 143°•sin 165°• tg 87°•cos 126°; г) соs 32° • sin 132º•cos 135°• tg 92°​
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