(3x- 8/(2-5x))'=3-(-8×(-5))/(2-5x)²=3- 40/(2-5x)²
(2\/x+6/x+tgx-4sinx)'=(\/x)/x - 6/x² +1/(cos x)²-4cos x
((sin x) /x)'=(xcos x-sin x) /x²
(x² tg x)' =2xtg x + x²/cos² x
(x^5+x⁴+3/x)'=5x⁴+4x³-3/x²
(3x- 8/(2-5x))'=3-(-8×(-5))/(2-5x)²=3- 40/(2-5x)²
(2\/x+6/x+tgx-4sinx)'=(\/x)/x - 6/x² +1/(cos x)²-4cos x
((sin x) /x)'=(xcos x-sin x) /x²
(x² tg x)' =2xtg x + x²/cos² x
(x^5+x⁴+3/x)'=5x⁴+4x³-3/x²