Through a point P (7,0), the tangent length of the direction circle x square + y square - 4x-5 = 0 is?

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• 1. How many lines are there that are tangent to the square of circle C: x + (y + 5) and have equal intercept on two coordinate axes? How many lines are there that are tangent to the square of circle C: x + (y + 5) and have equal intercept on two coordinate axes?
• 2. What is the linear equation that is tangent to the square of the circle x + (Y-2) and the intercept on the two axes is equal (the intercept is not 0)? You can't square your cell phone! Exam, urgent!
• 3. It is common to the line tangent to the circle x2 + (Y-2) 2 = 1 with equal intercept on the two coordinate axes______ Article
• 4. As shown in the figure, the coordinates of the center C are (2,2), and the circle C is tangent to the x-axis and y-axis. (1) find the general equation of the circle C; (2) find the linear equation which is tangent to the circle C and has the same intercept on the x-axis and y-axis
• 5. As shown in the figure, the coordinates of the center of the circle C are (1,1), and the circle C is tangent to the x-axis and y-axis. (1) find the equation of the circle C; (2) find the equation of the line which is tangent to the circle C and has the same intercept on the x-axis and y-axis
• 6. The equation for finding the line tangent to the circle C: x2 + (y + 5) 2 = 3 and with equal intercept on x-axis and y-axis
• 7. How to find the linear equation which is tangent to the circle x square + (y + 5) square = 3 and has the same intercept on the X and Y axes?
• 8. Given that circle C: (X-2) ^ 2 + y ^ 2 = 3, line L is tangent to circle C and its intercept on two coordinate axes is equal, the equation of line L is obtained ...
• 9. Given the circle C (X-2) 2 + y2 = 2, if the line L is tangent to the circle and the intercept of the two axes is equal,
• 10. Through the point P (4,4), make the tangent line of the circle X & # 178; + Y & # 178; - 6x-4y + 12 = 0, and find the general equation of the tangent line
• 11. When the fractional equation x-1x-3xx-1 + 1 = 0 is solved by the substitution method, if x-1x = y, the original equation is transformed into an integral equation about y, then the integral equation is () A. y2+y-3=0B. y2-3y+1=0C. 3y2-y+1=0D. 3y2-y-1=0
• 12. Whether there is a, so that sina + cosa = 3 / 2
• 13. 0°
• 14. Given a = {(x, y) | x = √ 2 cosa, y = √ 2 Sina + m, a is a parameter} B = {{x, y) | x = t + 3, y = 3-T, t is a parameter} and a ∩ B ≠ & # 8709;, the value range of real number m is obtained
• 15. Given the point m (COSA, Sina), in the plane region represented by the inequality system x-y-1 ≤ 0, x + Y-1 ≤ 0, then the maximum and minimum values of the distance from the point m to the line 6x-y-4 = 0 are m, n respectively, then m-2n is equal to
• 16. How does Sina / (1 + COSA) turn into Tan (A / 2)?
• 17. Let a belong to (0, π / 2), and the equation x ^ 2 / Sina + y ^ 2 / cosa = 1 denotes an ellipse with focus on the x-axis, then a belongs to
• 18. If the equation x ^ 2sina-y ^ 2cosa = 1 for X, y denotes an ellipse, then which quadrant is the center of the circle (x + Sina) ^ 2 + (y + COSA) ^ 2 = 9?
• 19. The equation of the circle is (x-cosa) ^ 2 + (y-sina) ^ 2 = 1 / 2. When a changes from 0 to 2 π, the area swept by the moving circle is 3Q .
• 20. It is known that the minimum positive period of the function f (x) = 2Sin (ω X - π / 6) sin (ω x + π / 3) (where ω is a normal number and X ∈ R) is π (1) Finding the value of ω (2) In △ ABC, if a < B and f (a) = f (b) = 1 / 2, find BC / ab