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# Trigonometry Forum

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

1. ### How do I solve cos(X-20degrees)= 1/2 ?

• Replies: 5
• Views: 908
Mar 18th 2018, 03:12 AM
2. ### Proof of an equation

• Replies: 6
• Views: 722
Mar 5th 2018, 03:22 AM
3. ### inverse trig

• Replies: 1
• Views: 767
Feb 28th 2018, 12:44 PM
4. ### integrals of inverse trig

• Replies: 2
• Views: 745
Feb 28th 2018, 06:55 AM
5. ### Triangle Circle Problem

• Replies: 3
• Views: 778
Feb 23rd 2018, 02:45 PM
6. ### Introduction

• Replies: 0
• Views: 551
Feb 21st 2018, 06:39 AM
7. ### winter olympics 2018

• Replies: 0
• Views: 856
Feb 13th 2018, 10:19 AM
8. ### Trigonometry

• Replies: 3
• Views: 538
Feb 2nd 2018, 09:44 PM
9. ### Triangle Angle bisector problem

• Replies: 2
• Views: 957
Jan 30th 2018, 06:37 AM
10. ### https://bowl-senior.com

• Replies: 0
• Views: 506
Jan 27th 2018, 06:42 AM
11. ### Senior Bowl

• Replies: 0
• Views: 501
Jan 27th 2018, 06:38 AM
12. ### [SOLVED] Eagles vs Vikings

• Replies: 0
• Views: 516
Jan 21st 2018, 12:05 PM
13. ### How can I find t?

• Replies: 1
• Views: 552
Jan 15th 2018, 04:02 PM
14. ### Definition of sine or cosine

• Replies: 5
• Views: 595
Jan 7th 2018, 10:06 PM
15. ### tan 89 or tan 89.9

• Replies: 7
• Views: 840
Jan 7th 2018, 10:08 AM
16. ### reference angles

• Replies: 2
• Views: 534
Dec 29th 2017, 03:48 AM
17. ### Did I solve these problems correctly?

• Replies: 1
• Views: 502
Nov 25th 2017, 02:42 PM
18. ### not sure what to do

• Replies: 4
• Views: 540
Nov 24th 2017, 12:44 PM

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# how to provr a point is co planar

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