Toán Lớp 11: tìm ymax, ymin
y=cosx-(căn3)sinx
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Toán Lớp 11: tìm ymax, ymin
y=cosx-(căn3)sinx
Comments ( 2 )
y = \cos x – \sqrt 3 \sin x\\
\frac{y}{2} = \frac{1}{2}\cos x – \frac{{\sqrt 3 }}{2}\sin x\\
\frac{y}{2} = \sin (\frac{\pi }{6} – x)\\
– 1 \le \sin (\frac{\pi }{6} – x) \le 1\\
\Rightarrow – 1 \le v \le 2\\
MAX = 2\\
MIN = – 2
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