DimaMazin

a is arc of unit circle in radians. It shown on diagram.

I have mistaken because it correct only when à=Pi/4 . You are correct only in the case too. Because green line is not tangenta to the circle in point [cos(a); sin(a)] . It is tangenta in other point.

Let's fistly consider what is sectorsgenta then the hypothesis

a=2sin(a) I have no higher education and I am janitor therefore I don't understand why we can not to exactly solve it relative to Pi. Can next method be correct?

Seems we can exactly solve such problem: a - sin(a) = (Pi - 2)/2 😛

I correctly started, but in frame S' we should consider instantaneous acceleration of carriages from frame S to frame S". S is traveling at v in frame S'. S" is traveling at u' in frame S'. When ve have correct formula then we can try to serch for neutral simultaneity.

y = cos(a)/(1+2sin(a)) cos(a)/(1+2sin(a))=(p-6a)/2

Maybe you think sin and cos are sin(a) and cos(a)? No. sin is sin(p/2 +a) and cos is cos(p/2 +a) as it showed on diagram.

Can such problem be solved? Area A =area of the green segment. x=-cos/(1-2cos) y=sin/(1-2cos) sin/(1-2cos)=(p-6a)/2

Russian military don't want to be under hood of KGB. Do you think after the arrest the Russian bloggers cannot publish independent information?

Russian troops use Telegram for transmit information.

Thanks. My idea is wrong again.

How to check next idea: t=2sin(t) a= cos(a) b=2(t-a)+a sin(b)=a - sin(a) ?

Lets consider known equation: dsin(a)=cos(a)×da da is near zero I speculatively derivated from it this n÷(cos(a1)+cos(a2)+...+cos(an-1)+cos(a))=2sin(a)÷(a+sin(a)×cos(a)) n is infinite natural number a1=a÷n When n is small then the equation is approximate. Can it be so?

Can sin(1 rad) be 75000×Pi ÷ 280009 ?