3 cos (t)
d / 3 \ --\cos (t)/ dt
Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
The derivative of cosine is negative sine:
The result of the chain rule is:
The answer is:
2 -3*cos (t)*sin(t)
/ 2 2 \ 3*\- cos (t) + 2*sin (t)/*cos(t)
/ 2 2 \ 3*\- 2*sin (t) + 7*cos (t)/*sin(t)