Tìm GTNN, GTLN: y= cos4x - sin4x + 2

K

khunjck

p2:

y =cos4x - sin4x + 2 = [TEX]\frac{1}{\sqrt{2}}.cos4x - sin4x.\frac{1}{\sqrt{2}} +2[/TEX] = [TEX]\sqrt{2}.sin(\frac{\pi}{4} - 4x) + 2[/TEX]

-->Max y = [TEX]\sqrt{2} + 2[/TEX]

--->Miny=[TEX] -\sqrt{2} + 2[/TEX]

p1: bạn gõ lại bằng Latex đi nhé.
 
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