Answer:
Circle
Step-by-step explanation:
if square plus circle is triangle then if you subtract a square from it all you have left is a circle
22. the second one: 4/15x
1,2,4,8 I might of missed something
Dy/dx = (ycos(x))/(1 + y²)
(1 + y²)/y dy = cos(x) dx
(1/y + y) dy = cos(x) dx
Integrating:
ln(y) + y²/2 = sin(x) + c
ln(1) + 1/2 = sin(0) + c
c = 1/2
Thus,
ln(y) + y²/2 = sin(x) + 1/2
