Answer:
y=6cos 45° +4
=6(1/√2)+4
=6/√2+4
Step-by-step explanation:
y=acosx+b
find a and b
y=b=4 when x=90 degrees because cos 90=0
find a : when x=60 degrees, y=7
7=acos60°+4
7=a(1/2)+4
a/2=3
a=6
