Answer
02/11/15.
Work Step by Step
It is better to have a sharp mind when working on a trigonometry chapter. We need to find a maximum on the intellectual curve in February, which happens on 02/11/15.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.