Nilaikan
-\frac{\sqrt{3}}{2}\approx -0.866025404
Kongsi
Disalin ke papan klip
\cos(\frac{\pi }{2}+\frac{\pi }{3})=\cos(\frac{\pi }{2})\cos(\frac{\pi }{3})-\sin(\frac{\pi }{3})\sin(\frac{\pi }{2})
Gunakan \cos(x+y)=\cos(x)\cos(y)-\sin(y)\sin(x) dimana x=\frac{\pi }{2} dan y=\frac{\pi }{3} untuk mendapatkan hasil.
0\cos(\frac{\pi }{3})-\sin(\frac{\pi }{3})\sin(\frac{\pi }{2})
Dapatkan nilai \cos(\frac{\pi }{2}) daripada nilai trigonometric.
0\times \frac{1}{2}-\sin(\frac{\pi }{3})\sin(\frac{\pi }{2})
Dapatkan nilai \cos(\frac{\pi }{3}) daripada nilai trigonometric.
0\times \frac{1}{2}-\frac{\sqrt{3}}{2}\sin(\frac{\pi }{2})
Dapatkan nilai \sin(\frac{\pi }{3}) daripada nilai trigonometric.
0\times \frac{1}{2}-\frac{\sqrt{3}}{2}\times 1
Dapatkan nilai \sin(\frac{\pi }{2}) daripada nilai trigonometric.
-\frac{\sqrt{3}}{2}
Lakukan pengiraan.
Contoh
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