Расчет: rnAp4O - 1

T  = 
 2* π* saknis( L* C)
T =  2* π* saknis( L* C)$$T$$ = $$2\cdot \pi\cdot \sqrt {L\cdot C}$$
 2* π* saknis( L* C) = T$$2\cdot \pi\cdot \sqrt {L\cdot C}$$ = $$T$$
saknis( L* C) =  
 T
/ 2/ π
$$\sqrt {L\cdot C}$$ = $$\frac{T}{2\cdot \pi}$$
C =  
 T^2
/ 4/ π^2/ L
$$C$$ = $$\frac{T^{2}}{4\cdot \pi^{2}\cdot L}$$
C =  
 0.25* T^2
/ L/ π^2
$$C$$ = $$\frac{0.25\cdot T^{2}}{L\cdot \pi^{2}}$$