We need to find the Y value when X equal 3. So sticking in three for our X6 tangent π thirds divided by 12 is really six tangent π force. Tangent of π force is just one. So 6 * 1 is 6. So our point is 3 sixths. Now we need to find the slope so Y prime equals 6. The derivative of tangent is secant squared Pi X / 12 and then we have to multiply that by the derivative of the Pi X / 12, so 6 secant squared Pi X / 12 * π twelfths, which would reduce to π half secant squared Pi X / 12. When we stick in the point X equal three, we get π half secant squared π force and secant of π force is root 2, so root 2 ^2 is 2 and 2 / 2 reduces. So our slope at this location is just π. Now we have a point and we have a slope, so we're going to stick it into point slope y - 6 equal π times the quantity X - 3. Distribute and solve for YY equal Pi X -, 3π + 6.