Diketahui segitiga sama kaki PQR \text{PQR}\ PQR dengan ∠P=∠Q=a\angle P=\angle Q=a∠P=∠Q=a dan ∠R=b\angle R=b∠R=b. Jika cosa=817\cos a=\frac{8}{17}cosa=178 maka tanb=....\tan b=....tanb=....
64161\frac{64}{161}16164
225161\frac{225}{161}161225
240161\frac{240}{161}161240
8161\frac{8}{161}1618
30161\frac{30}{161}16130