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5*sin(x)/4-cos(x)/2+3=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
5*sin(x)   cos(x)        
-------- - ------ + 3 = 0
   4         2           
$$\left(\frac{5 \sin{\left(x \right)}}{4} - \frac{\cos{\left(x \right)}}{2}\right) + 3 = 0$$
Gráfica
Suma y producto de raíces [src]
suma
      /    /         _____\\         /    /         _____\\         /    /         _____\\         /    /         _____\\
      |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||
- 2*re|atan|-- - ---------|| - 2*I*im|atan|-- - ---------|| + - 2*re|atan|-- + ---------|| - 2*I*im|atan|-- + ---------||
      \    \14       14   //         \    \14       14   //         \    \14       14   //         \    \14       14   //
$$\left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)}\right) + \left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)}\right)$$
=
      /    /         _____\\       /    /         _____\\         /    /         _____\\         /    /         _____\\
      |    |5    I*\/ 115 ||       |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||
- 2*re|atan|-- - ---------|| - 2*re|atan|-- + ---------|| - 2*I*im|atan|-- - ---------|| - 2*I*im|atan|-- + ---------||
      \    \14       14   //       \    \14       14   //         \    \14       14   //         \    \14       14   //
$$- 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)} - 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)}$$
producto
/      /    /         _____\\         /    /         _____\\\ /      /    /         _____\\         /    /         _____\\\
|      |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||| |      |    |5    I*\/ 115 ||         |    |5    I*\/ 115 |||
|- 2*re|atan|-- - ---------|| - 2*I*im|atan|-- - ---------|||*|- 2*re|atan|-- + ---------|| - 2*I*im|atan|-- + ---------|||
\      \    \14       14   //         \    \14       14   /// \      \    \14       14   //         \    \14       14   ///
$$\left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)}\right) \left(- 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)}\right)$$
=
  /    /    /         _____\\     /    /         _____\\\ /    /    /         _____\\     /    /         _____\\\
  |    |    |5    I*\/ 115 ||     |    |5    I*\/ 115 ||| |    |    |5    I*\/ 115 ||     |    |5    I*\/ 115 |||
4*|I*im|atan|-- - ---------|| + re|atan|-- - ---------|||*|I*im|atan|-- + ---------|| + re|atan|-- + ---------|||
  \    \    \14       14   //     \    \14       14   /// \    \    \14       14   //     \    \14       14   ///
$$4 \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)}\right) \left(\operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)} + i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)}\right)$$
4*(i*im(atan(5/14 - i*sqrt(115)/14)) + re(atan(5/14 - i*sqrt(115)/14)))*(i*im(atan(5/14 + i*sqrt(115)/14)) + re(atan(5/14 + i*sqrt(115)/14)))
Respuesta rápida [src]
           /    /         _____\\         /    /         _____\\
           |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||
x1 = - 2*re|atan|-- - ---------|| - 2*I*im|atan|-- - ---------||
           \    \14       14   //         \    \14       14   //
$$x_{1} = - 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} - \frac{\sqrt{115} i}{14} \right)}\right)}$$
           /    /         _____\\         /    /         _____\\
           |    |5    I*\/ 115 ||         |    |5    I*\/ 115 ||
x2 = - 2*re|atan|-- + ---------|| - 2*I*im|atan|-- + ---------||
           \    \14       14   //         \    \14       14   //
$$x_{2} = - 2 \operatorname{re}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)} - 2 i \operatorname{im}{\left(\operatorname{atan}{\left(\frac{5}{14} + \frac{\sqrt{115} i}{14} \right)}\right)}$$
x2 = -2*re(atan(5/14 + sqrt(115)*i/14)) - 2*i*im(atan(5/14 + sqrt(115)*i/14))
Respuesta numérica [src]
x1 = -1.19028994968253 + 1.4397651514007*i
x2 = -1.19028994968253 - 1.4397651514007*i
x2 = -1.19028994968253 - 1.4397651514007*i