[Toán 11] Lượng giác

N

niemkieuloveahbu

Đánh giá:

[TEX]sinx+cosx \leq \sqrt{2}\\sin2x \leq 1 \Rightarrow sin^72x \leq 1 \Rightarrow \sqrt{2}(2-sin^72x) \geq \sqrt{2}[/TEX]

Dấu bằng xảy ra [TEX]\Leftrightarrow x=\frac{\pi}{4}+k2\pi[/TEX]
 
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