Toán Lớp 11: y= x^3 -sinx/ cos2x chẵn hay lẻ
giúp giải chi tiết vs ạ.
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Toán Lớp 11: y= x^3 -sinx/ cos2x chẵn hay lẻ
giúp giải chi tiết vs ạ.
Comments ( 2 )
y\left( { – x} \right) = \dfrac{{{{\left( { – x} \right)}^3} – \sin \left( { – x} \right)}}{{\cos \left( { – 2x} \right)}}\\
= \dfrac{{ – {x^3} + \sin x}}{{\cos 2x}} = – \dfrac{{{x^3} – \sin x}}{{\cos 2x}}\\
= – y\left( x \right)
\end{array}\)