sin(7*x)=0

с изменением знака при 0

Получим:
$$sin{left (7 x right )} = 0$$
Это ур-ние преобразуется в
$$7 x = 2 pi n + {asin}{left (0 right )}$$
$$7 x = 2 pi n – {asin}{left (0 right )} + pi$$
Или
$$7 x = 2 pi n$$
$$7 x = 2 pi n + pi$$
, где n – любое целое число
Разделим обе части полученного ур-ния на
$$7$$
получим ответ:
$$x_{1} = frac{2 pi}{7} n$$
$$x_{2} = frac{2 pi}{7} n + frac{pi}{7}$$

pi
x2 = —
7

x1 = 74.0518268346000

x2 = 30.0695296844000

x3 = 12.1175716638000

x4 = -71.8078320821000

x5 = -79.8862131913000

x6 = 98.2869701623000

x7 = -27.8255349318000

x8 = -83.9254037459000

x9 = -48.0214877049000

x10 = 26.0303391297000

x11 = 52.0606782595000

x12 = -45.7774929523000

x13 = -96.0429754097000

x14 = 43.9822971503000

x15 = -39.9431065956000

x16 = 61.9342551708000

x17 = -87.9645943005000

x18 = 24.2351433277000

x19 = -4.03919055462000

x20 = 54.3046730121000

x21 = 87.9645943005000

x22 = -13.9127674659000

x23 = -89.7597901026000

x24 = 90.2085890531000

x25 = -32.3135244369000

x26 = 8.07838110923000

x27 = 56.0998688141000

x28 = -17.9519580205000

x29 = -30.0695296844000

x30 = -8.97597901026000

x31 = 48.0214877049000

x32 = -21.9911485751000

x33 = -37.6991118431000

x34 = 63.2806520223000

x35 = 21.9911485751000

x36 = 34.1087202390000

x37 = -92.0037848551000

x38 = 0.0

x39 = -70.0126362800000

x40 = 68.2174404779000

x41 = 50.2654824574000

x42 = -59.6902604182000

x43 = 28.2743338823000

x44 = -43.9822971503000

x45 = 76.2958215872000

x46 = -81.6814089933000

x47 = -23.7863443772000

x48 = 82.1302079438000

x49 = -75.8470226367000

x50 = 72.2566310326000

x51 = -65.9734457254000

x52 = -72.7054299831000

x53 = -5.83438635667000

x54 = 60.1390593687000

x55 = 32.3135244369000

x56 = 64.1782499233000

x57 = 17.9519580205000

x58 = 38.1479107936000

x59 = 92.0037848551000

x60 = -101.877361766000

x61 = -53.8558740615000

x62 = -67.7686415274000

x63 = -1.79519580205000

x64 = 42.1871013482000

x65 = 94.2477796077000

x66 = 20.1959527731000

x67 = -35.9039160410000

x68 = -74.0518268346000

x69 = 46.2262919028000

x70 = -31.8647254864000

x71 = -85.7205995480000

x72 = 16.1567622185000

x73 = 100.082165964000

x74 = -49.8166835069000

x75 = -15.7079632679000

x76 = -57.8950646162000

x77 = 83.4766047954000

x78 = 65.9734457254000

x79 = -19.7471538226000

x80 = 70.0126362800000

x81 = 2.24399475256000

x82 = -63.7294509728000

x83 = -97.8381712118000

x84 = -9.87357691128000

x85 = 4.03919055462000

x86 = -61.9342551708000

x87 = 6.28318530718000

x88 = 96.0429754097000

x89 = -93.7989806572000

x90 = -41.7383023977000

x91 = -26.0303391297000

x92 = 78.0910173892000

x93 = 86.1693984985000

x94 = 39.9431065956000

x95 = -52.0606782595000