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1)y=x^6*lnx
y` = 6x⁵ * lnx + x⁶ * (1/x) = 6x⁵ * lnx + x⁵
2) y=5sin3x/6cos5x
y` = [5*3*cos3x * 6cos5x - 6*5*(-sin5x)*5sin3x] / (6cos5x)² =
= [90*cos3x*cos5x + 150*sin5x*sin3x] / (36cos²5x)