Question

can you guys help me??

Answer 1

1 ) -7/8
2 ) 4√11/15
3 ) 3/5


sin^2+cos^2=1
sin^2+(√15/8)^2=1
sin^2=1-15/64
sin^2=49/64
sin=7/8
theta falls in 4th quadrant where sin is negative therefore SIN=-7/8

and
(-7/15)^2+cos^2=1
cos^2=1-49/225
cos^2=176/225
cos=√176/15
cos=4√11/15
here there falls in 4th quadrant
therefore cos is positive
COS=4√11/15

(4/5)^2+cos^2=1
cos^2=1-16/25
cos^2=9/25
cos=3/5
theta falls in 3th quadrant where cos is negative therefore
COS=-3/5