It is known that F1 and F2 are the left and right focal points of hyperbola C: x2-y2 = 1, and point P is on C, ∠ f1pf2 = 60 °, then | Pf1 | · | PF2 | = () A. 2B. 4C. 6D. 8 | Math enthusiast | Mathematical art

It is known that F1 and F2 are the left and right focal points of hyperbola C: x2-y2 = 1, and point P is on C, ∠ f1pf2 = 60 °, then | Pf1 | · | PF2 | = () A. 2B. 4C. 6D. 8

A = 1, B = 1, C = 2, a = 1, B = 1, B = 1, B = 1, C = 2, a hyperbolequation is a = 1, B = 1, B = 1, B = 1, C = 2, and the cosine theorem is cos \\65124; equation is a = 1, B = 1, B = 1, B = 1, C = 2, and the cosine theorem is the cos \\124; f1pf2 | 5 | Pf1

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1. Given that F1 and F2 are the left and right focus of hyperbola C: x2-y2 = 1, point P is on C, and angle f1pf2 = 60 degrees, then the value of | Pf1 | multiplied by | PF2 | is How is it wrong to use the area bridge: 1 / 2 | Pf1 | multiply | PF2 | sin60 = b-cot60 / 2, which is different from the answer
2. It is known that the left and right focal points of the hyperbola x ^ 2 / 9-y ^ 2 / 16 = 1 are F1 and F2 respectively. If there is a point P on the hyperbola, then | Pf1 | times | PF2 | = 32 Try to find the area of triangle f1pf2
3. If the distance from point P to focus F1 on hyperbola x236 − Y2100 = 1 is equal to 7, then the distance from point P to another focus F2 is 7______ ．
4. If F1 and F2 are the two focal points of hyperbola x ^ 2 / 9-y ^ 2 / 16 = 1, if the distance between a point m on the hyperbola and one of its focal points is equal to 16, find the distance between the other focal point
5. Let F1 and F2 be the two focuses of hyperbola x2a2 − y2b2 = 1 (a > 0, b > 0). If F1, F2 and P (0, 2b) are the three vertices of an equilateral triangle, then the eccentricity of hyperbola is______ ．
6. It is known that the focus of the hyperbola X & # 178 / / A & # 178; - Y & # 178 / / B & # 178; = 1 is F1 and F2, And the point P on the hyperbola satisfies that Pf1 is perpendicular to PF2, Pf1 = 3, PF2 = 4?
7. The two focuses of hyperbola x squared / 9 - y squared / 16 = 1 are f1.f2, Point P is on hyperbola. If Pf1 is perpendicular to PF2, what is the distance from point P to X axis The answer in the book is 16 / 3
8. Let F 1 and F 2 be the two focuses of the hyperbola x ^ 2 / 4-y ^ 2 = 1, and point p be on the hyperbola If ∠ f1pf2 = 120 °, calculate the area of triangle f1pf2 Find the area of | Pf1 | PF2 | Find the minimum value of | Pf1 | PF2 |. It's wrong.
9. Let F1 and F2 be the left and right focus of hyperbola (x ^ 2) - (y ^ 2 / 9) = 1 respectively Let F1 and F2 be the left and right focus of hyperbola (x ^ 2) - (y ^ 2 / 9) = 1 respectively. If P is on hyperbola and Pf1 vector * PF2 vector = 0, then | Pf1 vector + PF2 vector | =? The answer is 2 root 10. But I can't work it out
10. It is known that the points F1 and F2 are the left and right focal points of the hyperbola x square, a square, y square and b square = 1 respectively. The line passing through F2 and perpendicular to the X axis and If the hyperbola intersects at two points AB, if Abf1 is an acute triangle, then the value range of eccentricity of the triangle yes
11. There is a point P on the hyperbola x ^ 2 / A ^ 2-y ^ 2 / b ^ 2 = 1, F1F2 is the left and right focus of the hyperbola, the angle f1pf2 = 90 ° and the three sides of the triangle f1pf2 The eccentricity of hyperbola can be determined by the arithmetic sequence
12. Let F1F2 be the focus of the hyperbola X / 4 minus y, p be on the hyperbola, and
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14. F1F2 is the left and right focus of the hyperbola, P is a point on the hyperbola, angle f1pf2 = 60 degrees, triangle pf1f2 = 12 √ 3, and eccentricity is 2
15. It is known that the two focal points of hyperbola x ^ 2 / 9-y ^ 2 / 16 = 1 are F1 and F2 respectively, the point P is on the hyperbola, and | Pf1 | x | PF2 | = 32, so the size of angle f1pf2 is calculated
16. It is known that the sum of the distances between the moving point P and the two focuses F1 and F2 of hyperbola 2x ^ 2-2y ^ 2 = 1 is 4 (1) The equation of trajectory C of moving point P is obtained; (2) If M is the moving point on the curve C, take M as the center and MF2 as the radius to make the circle M. if there are two intersections between the circle m and the Y axis, calculate the value range of abscissa of the point M
17. It is known that the left and right focus of hyperbola x ^ 2-2y ^ 2 = 2 are F1 and F2 respectively, and the moving point P satisfies the condition | Pf1 | + | PF2 | = 4 Let the locus e of the L intersection of the moving straight line passing through F2 and not perpendicular to the coordinate axis be at two points a and B. ask if there is a point D on the line of2, so that the parallelogram with DA and DB as the adjacent sides is a diamond? Make a judgment and prove it
18. It is known that the two focal points of hyperbola x ^ 2 / A ^ 2-y ^ 2 = 1 (a > 0) are F1 and F2. P respectively, which are the points on the hyperbola, and ∠ f1pf2 = 90 °, find / Pf1 / * / PF2/
19. It is known that P is a point on the right branch of hyperbola x2 / 16-y2 / 9 = 1, and F1 and F2 are the left and right focal points respectively. If | Pf1 |: | PF2 | = 3:2, calculate the coordinates of point P!
20. Let F 1 and F 2 be the left and right focal points of the hyperbola x 2-y 2 / 9 = 1 respectively. If P is on the hyperbola and pf1pf 2 = 0, then | Pf1 + PF2 | =?