Toán Lớp 11: xac dinh tinh chan le y=cosx-1
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Toán Lớp 11: xac dinh tinh chan le y=cosx-1
Comments ( 1 )
y = f\left( x \right) = \cos x – 1\\
\Leftrightarrow f\left( { – x} \right) = \cos \left( { – x} \right) – 1\\
= \cos x – 1\left( {do:\cos \left( { – x} \right) = \cos x} \right)\\
\Leftrightarrow f\left( { – x} \right) = f\left( x \right)
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