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cosx=0.7; tgx=y

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Gráfico:

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Solución

Ha introducido [src]
cos(x) = 7/10
$$\cos{\left(x \right)} = \frac{7}{10}$$
tan(x) = y
$$\tan{\left(x \right)} = y$$
tan(x) = y
Respuesta rápida
$$x_{1} = - \operatorname{acos}{\left(\frac{7}{10} \right)} + 2 \pi$$
=
$$- \operatorname{acos}{\left(\frac{7}{10} \right)} + 2 \pi$$
=
5.48778647699544

$$y_{1} = - \frac{\sqrt{51}}{7}$$
=
$$- \frac{\sqrt{51}}{7}$$
=
-1.02020406122041
$$x_{2} = \operatorname{acos}{\left(\frac{7}{10} \right)}$$
=
$$\operatorname{acos}{\left(\frac{7}{10} \right)}$$
=
0.795398830184144

$$y_{2} = \frac{\sqrt{51}}{7}$$
=
$$\frac{\sqrt{51}}{7}$$
=
1.02020406122041
Respuesta numérica [src]
x1 = 5.487786476995443
y1 = -1.020204061220407
x2 = -13.36176944454332
y2 = -1.020204061220407
x3 = -5.487786476995443
y3 = 1.020204061220407
x4 = 0.7953988301841435
y4 = 1.020204061220407
x5 = 13.36176944454332
y5 = 1.020204061220407
x5 = 13.36176944454332
y5 = 1.020204061220407