Ok so I am new to calculus and have come up to 3 questions in my book that I am not sure... Could someone help!

lim (x/x)

x→0

lim f(t) where f(t) = sin^2 (pie t), t < -2

x→-2 2t-4, t >= -2

lim ((1/x)-(1/|x|))

x→0+

For now I have 1 for the first one and does not exist for the other two...Can anyone confirm please?