Datrys sin7pi/6

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

Enrhifo

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

Camau Ateb

Defnyddio \sin(x+y)=\sin(x)\cos(y)+\sin(y)\cos(x) lle mae x=\pi a y=\frac{\pi }{6} i gael y canlyniad.

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

Cael gwerth \sin(\pi ) o’r tabl gwerthoedd trigonometrig.

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

Cael gwerth \cos(\frac{\pi }{6}) o’r tabl gwerthoedd trigonometrig.

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

Cael gwerth \sin(\frac{\pi }{6}) o’r tabl gwerthoedd trigonometrig.

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

Cael gwerth \cos(\pi ) o’r tabl gwerthoedd trigonometrig.

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

Gwnewch y gwaith cyfrifo.

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

Ffactor

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