Toán Lớp 11: (1-cos^2 x)^2 + 2cos^2 x .giải hộ mình dới ạ!!!
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Toán Lớp 11: (1-cos^2 x)^2 + 2cos^2 x .giải hộ mình dới ạ!!!
Comments ( 2 )
{\left( {1 – {{\cos }^2}x} \right)^2} + 2{\cos ^2}x\\
= 1 – 2{\cos ^2}x + {\cos ^4}x + 2{\cos ^2}x\\
= 1 + {\cos ^4}x
\end{array}$