[Toán 11]Giải pt lượng giác

N

niemkieuloveahbu

[TEX]PT \Leftrightarrow \{sin3x=1\\cos4x=1\ do\ sin3x \leq 1,cos4x \leq 1 \Rightarrow VT \leq VP[/TEX]
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L

lovelycat_handoi95

[tex]sin3x \leq 1 ;cos4x \leq 1 \forall x [/tex]

[TEX]\Rightarrow PT \Leftrightarrow \left{sin3x=1\\cos4x=1 [/TEX]

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