# Trigonometry Forum

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

1. ### In a triangle-sine of two angles are given .....find cos of 3rd angle

• Replies: 1
• Views: 919
Jul 11th 2011, 10:59 PM
2. ### domain related

• Replies: 1
• Views: 390
Jul 11th 2011, 09:08 PM
3. ### Find cos(A - B) and cos(A) - cos(B) given A+B=60 and CosA + Cos B=1

• Replies: 2
• Views: 1,091
Jul 11th 2011, 10:39 AM
4. ### [SOLVED] I'm having trouble getting the right answer to this ...

• Replies: 4
• Views: 677
Jul 11th 2011, 07:47 AM
5. ### Find Exact Value without Calculator

• Replies: 1
• Views: 612
Jul 11th 2011, 03:26 AM
6. ### Help me to solve this proof

• Replies: 3
• Views: 343
Jul 10th 2011, 05:23 AM
7. ### [SOLVED] To divide by zero in a trigonometric identity proof

• Replies: 4
• Views: 618
Jul 10th 2011, 03:46 AM
8. ### Trig identities: problem involving tan and double angle forumlas

• Replies: 1
• Views: 774
Jul 9th 2011, 01:00 PM
9. ### [SOLVED] Rotating a Point Around an Origin

• Replies: 2
• Views: 776
Jul 8th 2011, 05:38 AM
10. ### Help with Identity proof Please

• Replies: 9
• Views: 614
Jul 7th 2011, 11:27 AM
11. ### Relative Velocity Mental Maths Solution

• Replies: 6
• Views: 1,167
Jul 5th 2011, 11:01 PM
12. ### Finding exact values using the sum and difference identity

• Replies: 4
• Views: 1,817
Jul 3rd 2011, 07:38 AM
13. ### About the golden ratio

• Replies: 1
• Views: 626
Jul 3rd 2011, 02:33 AM
14. ### Equation help

• Replies: 3
• Views: 412
Jul 3rd 2011, 12:11 AM
15. ### Reversing the inequality direction, less than to greater and equal to

• Replies: 6
• Views: 653
Jul 2nd 2011, 12:10 PM
16. ### Finding all of the angles when sec(3x)

• Replies: 3
• Views: 1,924
Jul 1st 2011, 02:44 PM
17. ### trigonometrical

• Replies: 1
• Views: 477
Jul 1st 2011, 12:12 PM
18. ### Calculating the value for cotangent.

• Replies: 6
• Views: 800
Jun 30th 2011, 11:56 AM
19. ### Where did the trigonometrical functions come from???

• Replies: 4
• Views: 837
Jun 29th 2011, 09:53 AM
20. ### Need help simplifying

• Replies: 2
• Views: 401
Jun 28th 2011, 07:10 PM
21. ### tan identity

• Replies: 3
• Views: 437
Jun 27th 2011, 10:46 AM
22. ### Help with trigonometric problem!

• Replies: 1
• Views: 402
Jun 27th 2011, 04:26 AM
23. ### Area of a Triangle.

• Replies: 5
• Views: 640
Jun 27th 2011, 02:45 AM
24. ### Trigonometric equation

• Replies: 2
• Views: 619
Jun 27th 2011, 12:26 AM

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