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# Trigonometry Forum

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

1. ### sinx+cosx=0

• Replies: 5
• Views: 51,494
Jul 24th 2011, 08:21 AM
2. ### Why is cos pi = -1?

• Replies: 2
• Views: 35,057
Sep 11th 2008, 07:05 PM
3. ### Why is cosine(-x) equal to cosine(x)?

• Replies: 4
• Views: 34,199
Aug 6th 2010, 06:56 PM
4. ### cos x = sqrt(3)/2

• Replies: 3
• Views: 29,315
Oct 9th 2012, 10:18 AM
5. ### Exact values.

• Replies: 10
• Views: 22,214
Apr 28th 2010, 07:17 PM
6. ### sin(x)/tan(x) = cos(x)?

• Replies: 3
• Views: 21,828
Sep 1st 2009, 10:05 AM
7. ### Help with finding values of sin^2x=3/4

• Replies: 7
• Views: 21,209
Nov 8th 2012, 01:34 AM
8. ### Rewrite Acos(wt)+Bsin(wt) as Ccos(wt+D)

• Replies: 1
• Views: 18,167
Jun 10th 2010, 06:56 PM
9. ### Eliminating the parameter when sin and cos are involved.

• Replies: 5
• Views: 16,511
Jan 24th 2010, 07:45 PM
10. ### sin 2A + sin 2B + sin 2C = 4 sin A sin B sin C

• Replies: 4
• Views: 15,951
Oct 11th 2009, 02:05 PM
11. ### Finding cos (pi / 5)

• Replies: 5
• Views: 15,819
Jun 26th 2010, 08:37 PM
12. ### Proving Cofunction Identities

• Replies: 6
• Views: 15,688
Oct 27th 2009, 06:20 PM
13. ### What is the exact value of sin 12 degrees?

• Replies: 4
• Views: 14,827
Dec 13th 2009, 08:50 AM
14. ### exact values.. sin, cos, tan, cot, csc, sec...

• Replies: 1
• Views: 14,255
May 5th 2008, 02:24 PM
15. ### Integrate cos(x)cos(4x) dx

• Replies: 9
• Views: 14,121
Feb 15th 2013, 06:24 PM
16. ### sec x + tan x = root 3

• Replies: 1
• Views: 14,041
Dec 7th 2008, 03:07 PM
17. ### cot on calculator?

• Replies: 11
• Views: 13,261
Nov 12th 2008, 11:59 PM
18. ### Prove: (cosxcotx)/1-sinx - 1 = csc x

• Replies: 2
• Views: 12,536
Dec 8th 2008, 03:50 PM
19. ### sinusoidal function

• Replies: 8
• Views: 12,475
Jun 19th 2012, 02:30 PM
20. ### prove that sin2x+sin2y=2sin(x+y)cos(x-y)

• Replies: 2
• Views: 12,181
Mar 29th 2009, 03:15 PM
21. ### question on arcsec infinity

• Replies: 2
• Views: 11,950
Jul 31st 2010, 12:35 PM

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