How do You INTEGRATE cos(7-2X)dx

i keep getting the answer wrong :'(

Let u = cos(x)
du = -sin(x) dx

-[-sin(x) dx] / [cos(x)]²

-du / u²

1/u + c

1/cos(x) + c

sec(x) + c

int(cos(7 - 2*x), x) = (1/2)*sin( - 7 + 2*x) + C