Réitigh cos(θ)=xcos(180-θ)

$$\cos ( \theta ) =x \cos ( 180- \theta )$$

Réitigh do x. (complex solution)

$$x=\frac{2\cos(\theta )e^{180i-i\theta }}{\left(e^{-i\theta +180i}\right)^{2}+1}$$

$$\nexists n_{1}\in \mathrm{Z}\text{ : }\theta =\pi n_{1}-\frac{113\pi }{2}+180$$

Céimeanna chun Cothromóidí Líneacha a Réiteach

Athraigh na taobhanna ionas go mbeidh na téarmaí inathraitheacha ar fad ar an taobh clé.

$$x\cos(180-\theta )=\cos(\theta )$$

Tá an chothromóid i bhfoirm chaighdeánach.

$$\cos(180-\theta )x=\cos(\theta )$$

Roinn an dá thaobh faoi \cos(180-\theta ).

$$\frac{\cos(180-\theta )x}{\cos(180-\theta )}=\frac{\cos(\theta )}{\cos(180-\theta )}$$

Má roinntear é faoi \cos(180-\theta ) cuirtear an iolrúchán faoi \cos(180-\theta ) ar ceal.

$$x=\frac{\cos(\theta )}{\cos(180-\theta )}$$

Réitigh do x.

$$x=\frac{\cos(\theta )}{\sin(180)\sin(\theta )+\cos(180)\cos(\theta )}$$

$$\nexists n_{1}\in \mathrm{Z}\text{ : }\theta =\pi n_{1}-\frac{113\pi }{2}+180$$

Céimeanna chun Cothromóidí Líneacha a Réiteach

Athraigh na taobhanna ionas go mbeidh na téarmaí inathraitheacha ar fad ar an taobh clé.

$$x\cos(180-\theta )=\cos(\theta )$$

Tá an chothromóid i bhfoirm chaighdeánach.

$$\cos(180-\theta )x=\cos(\theta )$$

Roinn an dá thaobh faoi \cos(180-\theta ).

$$\frac{\cos(180-\theta )x}{\cos(180-\theta )}=\frac{\cos(\theta )}{\cos(180-\theta )}$$

Má roinntear é faoi \cos(180-\theta ) cuirtear an iolrúchán faoi \cos(180-\theta ) ar ceal.

$$x=\frac{\cos(\theta )}{\cos(180-\theta )}$$