Datrys sin(-5pi/6)

$$\sin ( - 5 \frac { \pi } { 6 } )$$

Enrhifo

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

Camau Ateb

Mynegwch -5\times \frac{\pi }{6} fel ffracsiwn unigol.

$$\sin(\frac{-5\pi }{6})$$

Defnyddio \sin(x+y)=\sin(x)\cos(y)+\sin(y)\cos(x) lle mae x=\frac{\pi }{2} a y=\frac{\pi }{3} i gael y canlyniad.

$$\sin(\frac{\pi }{2}+\frac{\pi }{3})=\sin(\frac{\pi }{2})\cos(\frac{\pi }{3})+\sin(\frac{\pi }{3})\cos(\frac{\pi }{2})$$

Cael gwerth \sin(\frac{\pi }{2}) o’r tabl gwerthoedd trigonometrig.

$$1\cos(\frac{\pi }{3})+\sin(\frac{\pi }{3})\cos(\frac{\pi }{2})$$

Cael gwerth \cos(\frac{\pi }{3}) o’r tabl gwerthoedd trigonometrig.

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

Cael gwerth \sin(\frac{\pi }{3}) o’r tabl gwerthoedd trigonometrig.

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

Cael gwerth \cos(\frac{\pi }{2}) o’r tabl gwerthoedd trigonometrig.

$$1\times \frac{1}{2}+\frac{\sqrt{3}}{2}\times 0$$

Gwnewch y gwaith cyfrifo.

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

Ffactor

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