Trigonometry
Find the quadrant in which x+yx+yx+y lies. Use trigonometric identities.
cosx=−725\cos x=-\frac{7}{25}cosx=−257, siny=425\sin y=\frac{4}{25}siny=254, xxx and yyy in quadrant II
Quadrant I
Quadrant II
Quadrant III
Quadrant IV