найти производную функции:

1. f'(x)=(0.5x⁴-2x²)(㏑x+3ctgx)'=(4*0.5*x³-4x)*(㏑x+3ctgx)+(0.5x⁴-2x²)(1/x-3/sin²x)=

(2x³-4x)*(㏑x+3ctgx)+(0.5x⁴-2x²)(1/x-3/sin²x)

2.  f'(x)=((x²+1)/(7x+1))'=(2x*(7x+1)-(x²+1)*7)/(7x+1)²=(14x²+2x-7x²-7)/(7x+1)²=

(7x²+2x-7)/(7x+1)²