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20 12 how to do the sixth question, the seventh question 15 of the college entrance examination in Shaanxi Province?
The sixth question is the intersection question (right)

(x-2)2+y2=4。 This is a circle. (3,0) is in a circle, so the line passing through this point must intersect the circle.

Question 7

If it is vertical, it is 1 *( 1)+2 * = = 0 (because it is vertical, the multiplication is equal to 0, and the derivative of trigonometric function is very basic).

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