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$$cos{left (x right )} = frac{1}{8}$$
– это простейшее тригонометрическое ур-ние
Это ур-ние преобразуется в
$$x = pi n + {acos}{left (frac{1}{8} right )}$$
$$x = pi n – pi + {acos}{left (frac{1}{8} right )}$$
Или
$$x = pi n + {acos}{left (frac{1}{8} right )}$$
$$x = pi n – pi + {acos}{left (frac{1}{8} right )}$$
, где n – любое целое число
x2 = acos(1/8)
x1 = 57.9941362602000
x2 = -57.9941362602000
x3 = -1490.56038630000
x4 = -39.1445803387000
x5 = -23.6872727331000
x6 = 83.1268774890000
x7 = 42.5368286546000
x8 = 32.8613950315000
x9 = -1.44546849563000
x10 = -55.1031992690000
x11 = 80.2359404977000
x12 = -42.5368286546000
x13 = 73.9527551905000
x14 = -48.8200139618000
x15 = 45.4277656459000
x16 = 67.6695698833000
x17 = -86.5191258049000
x18 = -17.4040874259000
x19 = 89.4100627961000
x20 = 23.6872727331000
x21 = -20.2950244172000
x22 = 1.44546849563000
x23 = -29.9704580403000
x24 = 7.72865380281000
x25 = -76.8436921818000
x26 = -80.2359404977000
x27 = 55.1031992690000
x28 = 92.8023111121000
x29 = 17.4040874259000
x30 = 29.9704580403000
x31 = 76.8436921818000
x32 = 48.8200139618000
x33 = 20.2950244172000
x34 = -89.4100627961000
x35 = -51.7109509531000
x36 = -36.2536433475000
x37 = -61.3863845762000
x38 = 61.3863845762000
x39 = -67.6695698833000
x40 = -92.8023111121000
x41 = 64.2773215674000
x42 = 14.0118391100000
x43 = 617.197628599000
x44 = -7.72865380281000
x45 = -26.5782097243000
x46 = -4.83771681155000
x47 = -70.5605068746000
x48 = -73.9527551905000
x49 = 11.1209021187000
x50 = -64.2773215674000
x51 = 99.0854964192000
x52 = -45.4277656459000
x53 = -14.0118391100000
x54 = 36.2536433475000
x55 = 70.5605068746000
x56 = -95.6932481033000
x57 = 51.7109509531000
x58 = -32.8613950315000
x59 = 26.5782097243000
x60 = -83.1268774890000
x61 = -11.1209021187000
x62 = -99.0854964192000
x63 = 4.83771681155000
x64 = 39.1445803387000
x65 = 86.5191258049000
x66 = 95.6932481033000
