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$$cos{left (x right )} = frac{1}{4}$$
– это простейшее тригонометрическое ур-ние
Это ур-ние преобразуется в
$$x = pi n + {acos}{left (frac{1}{4} right )}$$
$$x = pi n – pi + {acos}{left (frac{1}{4} right )}$$
Или
$$x = pi n + {acos}{left (frac{1}{4} right )}$$
$$x = pi n – pi + {acos}{left (frac{1}{4} right )}$$
, где n – любое целое число
x2 = acos(1/4)
x1 = 57.8667838363000
x2 = -23.8146251571000
x3 = 13.8844866860000
x4 = -45.3004132219000
x5 = -20.1676719932000
x6 = 70.4331544506000
x7 = 42.6641810786000
x8 = 26.4508573004000
x9 = -74.0801076145000
x10 = 7.60130137883000
x11 = 80.3632929217000
x12 = 4.96506923553000
x13 = -30.0978104642000
x14 = -64.1499691434000
x15 = 20.1676719932000
x16 = 74.0801076145000
x17 = -26.4508573004000
x18 = -11.2482545427000
x19 = 17.5314398499000
x20 = 67.7969223073000
x21 = -99.2128488432000
x22 = 95.5658956793000
x23 = -1421.31799549000
x24 = -17.5314398499000
x25 = -39.0172279147000
x26 = 55.2305516930000
x27 = 39.0172279147000
x28 = 89.2827103722000
x29 = 11.2482545427000
x30 = 92.9296635360000
x31 = 76.7163397578000
x32 = -70.4331544506000
x33 = -76.7163397578000
x34 = 1.31811607165000
x35 = -13.8844866860000
x36 = -48.9473663858000
x37 = 86.6464782289000
x38 = -57.8667838363000
x39 = 51.5835985291000
x40 = 48.9473663858000
x41 = -4.96506923553000
x42 = -55.2305516930000
x43 = -82.9995250650000
x44 = -189.813675287000
x45 = -67.7969223073000
x46 = 82.9995250650000
x47 = -80.3632929217000
x48 = 45.3004132219000
x49 = -95.5658956793000
x50 = -92.9296635360000
x51 = -89.2827103722000
x52 = -51.5835985291000
x53 = -42.6641810786000
x54 = -1.31811607165000
x55 = -32.7340426076000
x56 = -86.6464782289000
x57 = -36.3809957714000
x58 = -7.60130137883000
x59 = 64.1499691434000
x60 = -61.5137370001000
x61 = 23.8146251571000
x62 = 36.3809957714000
x63 = 32.7340426076000
x64 = 61.5137370001000
x65 = 99.2128488432000
x66 = 30.0978104642000