All points on this circle have coordinates that make this equation true. Free math lessons and math homework help from basic math to algebra geometry and beyond.
I know this is sorta like proving addition using multiplication but this is a proof none the less isn t it.
Sin2theta cos2theta 1 prove. The equation of the unit circle is x 2 y 2 1. A proof of one of the most well known identities in math. Endgroup egreg dec 14 13 at 22 53 begingroup egreg.
For any random point x y on the unit circle the coordinates can be. Students teachers parents and everyone can find solutions to their math problems instantly. Ask a question for free get a free answer to a quick problem.
Consider the triangle math pqr math where math angle pqr theta math and math pq 1 math from the basic definitions of math sin theta math and math. Begingroup you must know sin 2 theta cos 2 theta 1 in order to prove the subtraction formula. If sin theta sin 2 theta 1 prove that cos 2 cos 4 1 answer by mananth 15550 show source.
Endgroup nick dec 14 13 at 23 07. You can put this solution on your website. Most questions answered within 4 hours.