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The positional relationship between xcos θ + ysin θ + a = 0 and xsin θ - ycos θ + B = 0 is () A. Parallel B. vertical C. oblique D. related to the value of a, B, θ
When cos θ = 0 or sin θ = 0, one of the two lines has a slope of 0, the other does not exist, and the two lines are vertical. When cos θ and sin θ are not equal to 0, the slopes of the two lines are - 1 Tan θ & nbsp; and Tan θ, respectively. Obviously, the product of the slopes is - 1, so the two lines are vertical
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- 1. The position relationship between the straight line xcos θ + ysin θ + a = 0 and the straight line xsin θ - ycos θ + B = 0 is site:219.226.9.43 What is the position relationship between the straight line xcos θ + ysin θ + a = 0 and the straight line xsin θ - ycos θ + B = 0?
- 2. The positional relationship between xcos θ + ysin θ + a = 0 and xcos θ - ysin θ + B = 0 A. Parallel B. vertical C. oblique D. related to the value of a, B, θ D
- 3. It is known that X and y are the two sides of a triangle, α, & szlig; are the two corners of the same triangle, and X, y, α, & szlig; satisfy the following relation xsin α + ycos & szlig; = 0 and xcos α - ysin & szlig; = 0, find the value of α, β
- 4. 4 to the power of n · a to the power of 2n · B to the power of 3N = () to the power of n
- 5. Given that the nth power of a is 2 and the nth power of B is 3, then the 2nth power of a + the 3nth power of B
- 6. The sum of the first n terms of a sequence {an} is Sn = 2n ^ 2-3n, then A10 =?
- 7. The sum of the first n terms of the arithmetic sequence an is Sn = 3N ^ 2 + BN + C. If A3 = 17, what is A10
- 8. In the sequence {an}, an = 43-3n, then when Sn takes the maximum value, n=______ ．
- 9. How to simplify Sn = 4N + n (n-1) / 2 times 6 = 3N ^ 2 + n?
- 10. Proof of 1 / 2-1 / (n + 1) by the method of expansion and contraction
- 11. What is the maximum distance from point a (1, - 3) to the line xsin β + ycos β = 2?
- 12. Xcos Ω / A + ysin Ω / b = 1, xsin Ω / a-ycos Ω / b = 1
- 13. It is known that FX = two-thirds of cos π xcos two-thirds of x-sin three-thirds of xsin two-thirds of x-2sinxcosx. When x belongs to two-thirds of π, π, the zero point of FX is zero
- 14. Why cos (α - π / 4) = (COS α xcos π / 4) + (sin α xsin π / 4)? Which formula is used? I haven't seen it before
- 15. We know that Tan α = xsin β 1 − xcos β, Tan β = ysin α 1 − ycos α, and prove that sin α sin β = XY
- 16. It is known that a (2,0), B (0,2), C (COS θ, sin θ), O are the coordinate origin (1) Vector ac * vector BC = - 1 / 3, find the value of sin2 θ; (2) If ㄧ vector OA + vector OC ㄧ = root 7, and θ∈ (- π, 0), find the angle between vector OB and vector OC
- 17. It is known that a (3,0), B (0,3), C (COS α, sin α), O are the coordinates of the origin 1. If the vector OC is parallel to the vector AB, find Tan α 2. Let f (α) = | vector OA - vector OC |, find the maximum and minimum of F (α), and find the corresponding value of α
- 18. It is known that both α and β are acute angles, and COS (α + β) = sin (α - β), then Tan α=______ ．
- 19. If sin α + cos α = m, sin α × cos α = n (m ＞ 0, n ＞ 0), what is the relationship between M and N,
- 20. If sin α + cos α = m, sin α × cos α = n, then what is the relationship between M and N?