If `sec(alpha-beta)=sqrt(2) and sin(alpha+beta)=(1)/(2)`, then find the least positive values of ` - YouTube
If \sec(\alpha)=-\dfrac{17}{8}\ where\ \dfrac{\pi}{2} is less than \alpha is less than \pi\ and\ \tan(\beta)=\dfrac{20}{21}\ where\ \pi is less than \beta is less than \dfrac{3\pi}{2}, find the exact | Homework.Study.com