Question

Prove that the envelope of the family of lines $(\cos\theta+\sin\theta)x+(\cos\theta-\sin\theta)y+2\sin\theta-\cos\theta-4=0$

score 435 · Answer 1 · 2015-09-03 13:37:29

435

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Prove that the envelope of the family of lines $(\cos\theta+\sin\theta)x+(\cos\theta-\sin\theta)y+2\sin\theta-\cos\theta-4=0$

Published on 03 Sep 2015 - 13:37

score 1.6k · Answer 2 · 2015-09-03 15:15:25

1.6k

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Lines and planes - general concepts

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880

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956

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score 48 · Answer 5 · 2026-04-13 00:02:46

48

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Line through two points in Euclidian space

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128

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score 38 · Answer 7 · 2026-04-12 18:08:28

38

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General concepts of lines and planes

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score 161 · Answer 8 · 2015-09-07 12:51:13

161

Views

Hint for show that $\sin AOB \sin COD + \sin AOC \sin DOB + \sin AOD \sin BOC = 0$

Published on 07 Sep 2015 - 12:51

score 572 · Answer 9 · 2026-04-05 22:05:16

572

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Deducing formulas of analytic geometry

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score 606 · Answer 10 · 2015-09-07 15:26:31

606

Views

Find the area of the circle that falls between the circle $x^2+y^2=5$ and the lines $x^2-4y^2+6x+9=0$

Published on 07 Sep 2015 - 15:26

score 63 · Answer 11 · 2026-04-11 10:53:20

63

Views

Finding Points That Lie On A 3D Line?

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score 48 · Answer 12 · 2026-04-08 18:09:12

48

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Finding out which points lie on this equation?

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score 23 · Answer 13 · 2015-09-08 07:09:38

23

Views

Prove that the biscetors of adjacent suplementary angles are perpendicular?

Published on 08 Sep 2015 - 7:09

score 202 · Answer 14 · 2026-04-13 07:20:19

202

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What is the largest area from this following triangle?

Published on 13 Apr 2026 - 7:20

score 947 · Answer 15 · 2015-09-08 08:37:20

947

Views

Prove that $-3/2\leq\cos a + \cos b + \cos c\leq 3$?

Published on 08 Sep 2015 - 8:37

List Question

Prove that the envelope of the family of lines $(\cos\theta+\sin\theta)x+(\cos\theta-\sin\theta)y+2\sin\theta-\cos\theta-4=0$

Lines and planes - general concepts

"Hard" exercises on Linear Algebra and Analytic Geometry

Intersection of hyperplanes

Line through two points in Euclidian space

Rotation in multidimensional space

General concepts of lines and planes

Hint for show that $\sin AOB \sin COD + \sin AOC \sin DOB + \sin AOD \sin BOC = 0$

Deducing formulas of analytic geometry

Find the area of the circle that falls between the circle $x^2+y^2=5$ and the lines $x^2-4y^2+6x+9=0$

Finding Points That Lie On A 3D Line?

Finding out which points lie on this equation?

Prove that the biscetors of adjacent suplementary angles are perpendicular?

What is the largest area from this following triangle?

Prove that $-3/2\leq\cos a + \cos b + \cos c\leq 3$?

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