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# Trigonometry Forum

Trigonometry Help Forum: Graphing trig expressions, identities, angles, applied questions

1. ### sinx+cosx=0

• Replies: 5
• Views: 61,471
Jul 24th 2011, 07:21 AM
2. ### Why is cosine(-x) equal to cosine(x)?

• Replies: 4
• Views: 37,510
Aug 6th 2010, 05:56 PM
3. ### Why is cos pi = -1?

• Replies: 2
• Views: 35,282
Sep 11th 2008, 06:05 PM
4. ### cos x = sqrt(3)/2

• Replies: 3
• Views: 33,684
Oct 9th 2012, 09:18 AM
5. ### sin 2A + sin 2B + sin 2C = 4 sin A sin B sin C

• Replies: 4
• Views: 27,915
Oct 11th 2009, 01:05 PM
6. ### Help with finding values of sin^2x=3/4

• Replies: 7
• Views: 24,593
Nov 8th 2012, 12:34 AM
7. ### sin(x)/tan(x) = cos(x)?

• Replies: 3
• Views: 24,013
Sep 1st 2009, 09:05 AM
8. ### Exact values.

• Replies: 10
• Views: 22,524
Apr 28th 2010, 06:17 PM
9. ### Rewrite Acos(wt)+Bsin(wt) as Ccos(wt+D)

• Replies: 1
• Views: 22,496
Jun 10th 2010, 05:56 PM
10. ### cot on calculator?

• Replies: 11
• Views: 21,907
Nov 12th 2008, 10:59 PM
11. ### Eliminating the parameter when sin and cos are involved.

• Replies: 5
• Views: 21,131
Jan 24th 2010, 06:45 PM
12. ### what is cot(x+y)?

• Replies: 3
• Views: 19,128
Mar 25th 2010, 07:11 PM
13. ### sec x + tan x = root 3

• Replies: 1
• Views: 18,609
Dec 7th 2008, 02:07 PM
14. ### What is the exact value of sin 12 degrees?

• Replies: 4
• Views: 18,348
Dec 13th 2009, 07:50 AM
15. ### Finding cos (pi / 5)

• Replies: 5
• Views: 17,945
Jun 26th 2010, 07:37 PM
16. ### Proving Cofunction Identities

• Replies: 6
• Views: 17,370
Oct 27th 2009, 05:20 PM
17. ### question on arcsec infinity

• Replies: 2
• Views: 16,774
Jul 31st 2010, 11:35 AM
18. ### Integrate cos(x)cos(4x) dx

• Replies: 9
• Views: 16,727
Feb 15th 2013, 05:24 PM
19. ### prove that sin2x+sin2y=2sin(x+y)cos(x-y)

• Replies: 2
• Views: 16,640
Mar 29th 2009, 02:15 PM
20. ### sinusoidal function

• Replies: 8
• Views: 15,621
Jun 19th 2012, 01:30 PM
21. ### Verify that √((1-cosx)/(1+cosx)) = (1-cosx)/|sinx|

• Replies: 3
• Views: 15,116
Dec 10th 2008, 08:39 PM
22. ### Calculate the principle angle?

• Replies: 1
• Views: 14,903
Nov 11th 2007, 12:29 PM
23. ### Trigonometric Equations

• Replies: 4
• Views: 14,787
Oct 30th 2007, 12:04 PM

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# how to provr a point is co planar

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