explain why vectors are close to eachother in length and direction

a$)$ Sketen plane curve

b$)$ Find $r^{\text{'}}(t)$

c$)$ Sketch position vector $r(t)$ and tangent vector $r^{\text{'}}(t)$

$3.r(t)=($:$t-2,t^2+1$:$),=t=-1$

$7.r(t)=4sinti-2costj,t=3\frac{}{4}$

can i please have help with number $3$ and $7$ thank you for your time!