Réitigh sin7pi/6

$$\sin \frac { 7 \pi } { 6 }$$

Luacháil

$$-\frac{1}{2}=-0.5$$

Céimeanna Réitigh

Bain úsáid as \sin(x+y)=\sin(x)\cos(y)+\sin(y)\cos(x) nuair atá x=\pi agus y=\frac{\pi }{6}ann chun an toradh a fháil.

$$\sin(\pi +\frac{\pi }{6})=\sin(\pi )\cos(\frac{\pi }{6})+\sin(\frac{\pi }{6})\cos(\pi )$$

Faigh luach do\sin(\pi )ón dtábla luachanna triantánúla.

$$0\cos(\frac{\pi }{6})+\sin(\frac{\pi }{6})\cos(\pi )$$

Faigh luach do\cos(\frac{\pi }{6})ón dtábla luachanna triantánúla.

$$0\times \frac{\sqrt{3}}{2}+\sin(\frac{\pi }{6})\cos(\pi )$$

Faigh luach do\sin(\frac{\pi }{6})ón dtábla luachanna triantánúla.

$$0\times \frac{\sqrt{3}}{2}+\frac{1}{2}\cos(\pi )$$

Faigh luach do\cos(\pi )ón dtábla luachanna triantánúla.

$$0\times \frac{\sqrt{3}}{2}+\frac{1}{2}\left(-1\right)$$

Déan áirimh.

$$-\frac{1}{2}$$

Fachtóirigh

$$-\frac{1}{2} = -0.5$$