Nếu biết $\displaystyle 3{{\sin }^{4}}x+2{{\cos }^{4}}x=\frac{98}{81}$ thì giá trị biểu thức$\displaystyle A=2{{\sin }^{4}}x+3{{\cos }^{4}}x$ bằng
A. $\displaystyle \frac{101}{81}$ hay$\displaystyle \frac{601}{504}$.
B. $\displaystyle \frac{103}{81}$ hay$\displaystyle \frac{603}{405}$.
C. $\displaystyle \frac{105}{81}$ hay$\displaystyle \frac{605}{504}$.
D. $\displaystyle \frac{107}{81}$ hay$\displaystyle \frac{607}{405}$.
A. $\displaystyle \frac{101}{81}$ hay$\displaystyle \frac{601}{504}$.
B. $\displaystyle \frac{103}{81}$ hay$\displaystyle \frac{603}{405}$.
C. $\displaystyle \frac{105}{81}$ hay$\displaystyle \frac{605}{504}$.
D. $\displaystyle \frac{107}{81}$ hay$\displaystyle \frac{607}{405}$.
Loga
Hóa Học lớp 12
