Trigonometry
Find the quadrant in which x+yx+yx+y lies. Use trigonometric identities.
sinx=20101\sin x=\frac{20}{101}sinx=10120, siny=−2129\sin y=-\frac{21}{29}siny=−2921, xxx in quadrant I and yyy in quadrant III
Quadrant I
Quadrant II
Quadrant III
Quadrant IV