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$$cos{left (x right )} = frac{4}{5}$$
– это простейшее тригонометрическое ур-ние
Это ур-ние преобразуется в
$$x = pi n + {acos}{left (frac{4}{5} right )}$$
$$x = pi n – pi + {acos}{left (frac{4}{5} right )}$$
Или
$$x = pi n + {acos}{left (frac{4}{5} right )}$$
$$x = pi n – pi + {acos}{left (frac{4}{5} right )}$$
, где n – любое целое число
x2 = acos(4/5)
x1 = -43.3387960415000
x2 = -81.0379078845000
x3 = -55.9051666558000
x4 = 19.4930570303000
x5 = 5.63968419839000
x6 = 37.0556107343000
x7 = 99.8874638061000
x8 = 25.7762423375000
x9 = -30.7724254271000
x10 = 18.2060548127000
x11 = -37.0556107343000
x12 = -5.63968419839000
x13 = 82.3249101021000
x14 = 88.6080954093000
x15 = -82.3249101021000
x16 = -50.9089835662000
x17 = -94.8912807165000
x18 = 13.2098717232000
x19 = -6.92668641597000
x20 = -13.2098717232000
x21 = -49.6219813486000
x22 = 63.4753541806000
x23 = 87.3210931917000
x24 = 74.7547225774000
x25 = -88.6080954093000
x26 = 11.9228695056000
x27 = -69.7585394878000
x28 = 76.0417247949000
x29 = -76.0417247949000
x30 = 6.92668641597000
x31 = -63.4753541806000
x32 = -18.2060548127000
x33 = 69.7585394878000
x34 = 49.6219813486000
x35 = 50.9089835662000
x36 = 68.4715372702000
x37 = -93.6042784989000
x38 = -62.1883519630000
x39 = -25.7762423375000
x40 = 24.4892401199000
x41 = -101.174466024000
x42 = 81.0379078845000
x43 = -19.4930570303000
x44 = -24.4892401199000
x45 = 94.8912807165000
x46 = 38.3426129519000
x47 = 62.1883519630000
x48 = 4265.63932247000
x49 = -68.4715372702000
x50 = -44.6257982591000
x51 = 43.3387960415000
x52 = -32.0594276447000
x53 = -74.7547225774000
x54 = 57.1921688734000
x55 = 0.643501108793000
x56 = -87.3210931917000
x57 = -11.9228695056000
x58 = -57.1921688734000
x59 = 32.0594276447000
x60 = 55.9051666558000
x61 = 30.7724254271000
x62 = -38.3426129519000
x63 = 44.6257982591000
x64 = -99.8874638061000
x65 = -0.643501108793000
x66 = 93.6042784989000
