Nilaikan
\frac{\sqrt{2}}{2}\approx 0.707106781
Kongsi
Disalin ke papan klip
\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})
Gunakan \cos(x+y)=\cos(x)\cos(y)-\sin(y)\sin(x) dimana x=\frac{3\pi }{2} dan y=\frac{\pi }{4} untuk mendapatkan hasil.
0\cos(\frac{\pi }{4})-\sin(\frac{\pi }{4})\sin(\frac{3\pi }{2})
Dapatkan nilai \cos(\frac{3\pi }{2}) daripada nilai trigonometric.
0\times \frac{\sqrt{2}}{2}-\sin(\frac{\pi }{4})\sin(\frac{3\pi }{2})
Dapatkan nilai \cos(\frac{\pi }{4}) daripada nilai trigonometric.
0\times \frac{\sqrt{2}}{2}-\frac{\sqrt{2}}{2}\sin(\frac{3\pi }{2})
Dapatkan nilai \sin(\frac{\pi }{4}) daripada nilai trigonometric.
0\times \frac{\sqrt{2}}{2}-\frac{\sqrt{2}}{2}\left(-1\right)
Dapatkan nilai \sin(\frac{3\pi }{2}) daripada nilai trigonometric.
\frac{\sqrt{2}}{2}
Lakukan pengiraan.
Contoh
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