Question

Any help if possible :)

Answer 1

y=a*cos x +b

y=10, x=0
10=a*cos 0 +b
10=a+b

x=90
y=4
4=a*cos(90) +b
b=4

10=a+b
10=a+4
a=6

a=6,b=4

y=6*cos x +4
y=6*cos (45) +4
y =6*(√2/2)+4=3√2 +4
y= 3√2 +4

x=45⁰, y= 3√2 +4