A. sketch the plane curve with the given vector equation .
b. find rt (t).
c. sketch the position vector r(t) and the tangent vector r '(t) for the given value of t.

r(t)=4 sin t i -2cos t j, t =3ï / 4

goog may have it for you

lol 2

step-by-step explanation:

  or  

sin y = 7/q

7 is the opposite side length, q is the hypotenuse

tan y = 7/r

7 is the opposite side length, r is the adjacent side length

using sohcahtoa ^^^^

cos y = adjacent/hypotenuse

cos y = r/q