Nilaikan
-\frac{\sqrt{3}}{2}\approx -0.866025404
Kongsi
Disalin ke papan klip
\cos(\pi +\frac{\pi }{6})=\cos(\pi )\cos(\frac{\pi }{6})-\sin(\frac{\pi }{6})\sin(\pi )
Gunakan \cos(x+y)=\cos(x)\cos(y)-\sin(y)\sin(x) dimana x=\pi dan y=\frac{\pi }{6} untuk mendapatkan hasil.
-\cos(\frac{\pi }{6})-\sin(\frac{\pi }{6})\sin(\pi )
Dapatkan nilai \cos(\pi ) daripada nilai trigonometric.
-\frac{\sqrt{3}}{2}-\sin(\frac{\pi }{6})\sin(\pi )
Dapatkan nilai \cos(\frac{\pi }{6}) daripada nilai trigonometric.
-\frac{\sqrt{3}}{2}-\frac{1}{2}\sin(\pi )
Dapatkan nilai \sin(\frac{\pi }{6}) daripada nilai trigonometric.
-\frac{\sqrt{3}}{2}-\frac{1}{2}\times 0
Dapatkan nilai \sin(\pi ) daripada nilai trigonometric.
-\frac{\sqrt{3}}{2}
Lakukan pengiraan.
Contoh
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Had
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