5. (5 分) 若 $\tan a=\frac{3}{4}$, 则 $\cos ^{2} a+2 \sin 2 a=(\quad)$
Gaokao · Math · previous-year question
- A.$\frac{64}{25}$
- B.$\frac{48}{25}$
- C.1
- D.$\frac{16}{25}$
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