d/dx(x + 2) = d/dx(x) + d/dx(2) = 1 + 0 = 1
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y' = (sec(x))^2
The deriviative of sin2 x + cos2 x is 2 cos x - 2 sin x
2y + 2xy' + 4y + 4xy' = 0 6y + 6xy' = 0 y' = -y/x
y = x2 + 3/sqrt(x) = x2 + 3*x-1/2 dy/dx = 2x + 3*(-1/2)*x-3/2 = 2x - 3/2*x-3/2
sec^2(x)