Геометрический смысл производной:
f`(x)=3-2x
f`(-3)=3-2·(-3)=3+6=9
tgα=9
Arcctg(-11) = <span>- 0.0906598872
</span>arcctg(-4,6) = <span>- 0,214060684
</span>arcctg(143) = <span>24.0397953
</span>arcctg(143), arcctg(-4,6), arcctg(-11)
25 * 2 sin19*cos19/sin 38 = 25 sin 38 /sin 38 = 25