Variable Calc Help??

Question

r(t) = (4t − 2, t^2 + 5), t = −1 

Find r'(t).

r(t) = 5 sin ti + 4 cos tj, t = π/6 
Find r'(t). 

Answer 1

(1).

The solution as shown below.

Answer 2

(2).

The solution as shown below.