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# Forum: Trigonometry

Trigonometric Functions, Trigonometric Identities, etc.

2. ### sq. FD + sq. DB = sq. BF Almagest Ch 10 Book I Ptolemy

• Replies: 1
• Views: 914
June 30th, 2013, 22:02
3. ### [SOLVED] Trying to resolve a trig identity

• Replies: 1
• Views: 878
June 20th, 2013, 16:36
4. ### Cosine Equation

• Replies: 3
• Views: 874
June 5th, 2013, 14:23
5. ### Trigonometry equation

• Replies: 10
• Views: 1,383
May 20th, 2013, 10:11
6. ### Area/Trigonometry Problem.

• Replies: 10
• Views: 2,047
May 7th, 2013, 23:32
7. ### Given value of cos(A) and quadrant of A, find sin(A) and tan(A)

• Replies: 2
• Views: 654
May 7th, 2013, 04:27
8. ### Solutions for arcsin(x) + arcsin(k) = π/2

• Replies: 5
• Views: 1,211
May 6th, 2013, 12:57
9. ### Prove the summation identity.

• Replies: 1
• Views: 1,420
April 23rd, 2013, 14:59
10. ### Basic trig question - finding the period of a sinusoid

• Replies: 3
• Views: 820
April 18th, 2013, 01:26
11. ### Find x such that the given trigonometric expression equals zero.

• Replies: 8
• Views: 1,215
March 31st, 2013, 23:57
12. ### Determine the value of AC/BC.

• Replies: 2
• Views: 796
March 14th, 2013, 23:09
13. ### Trig Expression simplification

• Replies: 3
• Views: 910
February 22nd, 2013, 11:44
14. ### Using Trigonometry for solving a Cubic equation

• Replies: 5
• Views: 2,071
February 15th, 2013, 19:16
15. ### Range of sec^4(x) + csc^4(x)

• Replies: 10
• Views: 2,132
February 6th, 2013, 00:35
16. ### Trigonometric Summation

• Replies: 3
• Views: 1,541
January 25th, 2013, 11:43
17. ### Solution of Triangles

• Replies: 1
• Views: 958
January 23rd, 2013, 04:20
18. ### [SOLVED] Particle's position

• Replies: 6
• Views: 1,409
January 15th, 2013, 23:53
19. ### Proving a trigonometric equation

• Replies: 13
• Views: 2,118
January 15th, 2013, 20:38
20. ### [SOLVED] Finding the Area of Shaded Part

• Replies: 1
• Views: 1,200
December 2nd, 2012, 01:15
21. ### Solving a Trigonometric Equation for Cos (x)

• Replies: 3
• Views: 1,413
November 12th, 2012, 15:10
22. ### Finding the Range of a Trigonometric Function

• Replies: 6
• Views: 4,873
November 11th, 2012, 16:39

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