a) G = 2sin$\alpha$ + cos$\alpha$
Do tan$\alpha$ > 0 nên $\alpha$ là góc nhọn.
G = $2\frac{sin\alpha}{cos\alpha} + \frac{cos\alpha}{cos\alpha}$
G = $\sqrt{5}$
b) H = $\frac{2sin\alpha + cos\alpha}{sin\alpha - cos\alpha}$
Do tan$\alpha$ > 0 nên $\alpha$ là góc nhọn.
H = $\frac{2\frac{sin\alpha}{cos\alpha}+\frac{cos\alpha}{cos\alpha}}{\frac{sin\alpha}{cos\alpha}-\frac{cos\alpha}{cos\alpha}}$
H = $\frac{2.tan\alpha+1}{tan\alpha-1}$
H = $\frac{2.2+1}{2-1}$
H = 5