8. f(x) = 2sin² 3x a. 12cos(3x)sin(3x) b. -12cos(3x)sin(3x) c. 12sin(9x)cos(3x) 9. f(x) = 3 cos² a. 3 cos )sin) ь. —3 сos(sin) с. -3 сos(stnc 10. f(x) = sec? x – tan² x а. О b. -2 C. -10

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