Trigonometry
Find the quadrant in which x+yx+y lies. Use trigonometric identities.
cosx=−112113\cos x=-\frac{112}{113}cosx=−113112, siny=8485\sin y=\frac{84}{85}siny=8584, xxx in quadrant II and yyy in quadrant I
Quadrant I
Quadrant II
Quadrant III
Quadrant IV