Enrhifo
\frac{\sqrt{2}}{2}\approx 0.707106781
Rhannu
Copïo i clipfwrdd
\cos(\frac{3\pi }{2}+\frac{\pi }{4})=\cos(\frac{3\pi }{2})\cos(\frac{\pi }{4})-\sin(\frac{\pi }{4})\sin(\frac{3\pi }{2})
Defnyddio \cos(x+y)=\cos(x)\cos(y)-\sin(y)\sin(x) lle mae x=\frac{3\pi }{2} a y=\frac{\pi }{4} i gael y canlyniad.
0\cos(\frac{\pi }{4})-\sin(\frac{\pi }{4})\sin(\frac{3\pi }{2})
Cael gwerth \cos(\frac{3\pi }{2}) o’r tabl gwerthoedd trigonometrig.
0\times \frac{\sqrt{2}}{2}-\sin(\frac{\pi }{4})\sin(\frac{3\pi }{2})
Cael gwerth \cos(\frac{\pi }{4}) o’r tabl gwerthoedd trigonometrig.
0\times \frac{\sqrt{2}}{2}-\frac{\sqrt{2}}{2}\sin(\frac{3\pi }{2})
Cael gwerth \sin(\frac{\pi }{4}) o’r tabl gwerthoedd trigonometrig.
0\times \frac{\sqrt{2}}{2}-\frac{\sqrt{2}}{2}\left(-1\right)
Cael gwerth \sin(\frac{3\pi }{2}) o’r tabl gwerthoedd trigonometrig.
\frac{\sqrt{2}}{2}
Gwnewch y gwaith cyfrifo.
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