Painless Trigonometry: (December 7 – December 14, 2013)


Square of a Sine

What is the sum of sin21+sin22 +. . .+sin289 ?


Comment your answer below. Note: I am the only one who can see your comments. You are only allowed to comment your answer once. Comments will be revealed next week December 14,2013(Philippines Time). You can also send your answer to .  Please don’t forget to include the name of your school.Names of those who commented the correct answer will be posted in this page immediately after the answer has been reviewed. Happy Solving!


Correct answer were submitted by:

1.  Caesar Ian B. Pedro. University of the Philippines-Diliman

2. John Rey Jimenez. Negros Occidental High School

3. Arsh Singh.

4. Gio Alfred Gloria. Cauayan City National High School

5. Jomari Tan. DLSU

6. Sebastian Pimber. Colombia

7. John Michael Maninang.UST

8. Oen Can.Saint Mary’s University

9. Marlon Chris Malicsi, UST

10. Jhay Dela Cruz. PUP-Taguig

11. Jeffry Robles. UP-Diliman

12. Muthu Krishnan. Kle College , Bengaluru

13. Tayfun Torunoglu. Middle East Technical University. Istanbul, Turkey

14. Spandy( complete name and school please)

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8 Responses

  1. Caesar Pedro says:


  2. Gio Alfred Gloria says:


  3. Gio Alfred Gloria says:

    from Cauayan City National High School

  4. JM Maninang says:

    John Michael Maninang


  5. Jhay Dela Cruz says:



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