Question

find the equation of the tangent line to the curve y=sinx @ x=pi/3 using the derivative function

Answer 1

find derivative of y=sin x, thats your slope

then put x= pi/3 and find actual value of slope,
use y-y1=m(x-x1) to find equation

Answer 2

@DRico What's derivative of sinx?

Answer 3

make sure you do find value of y co-ordinate using x=pi/3