Calculation: shrWCD - 1

tan(φ)  = 
 
 (X_L-X_C)
/ R
tan(φ) =  
 (X_L-X_C)
/ R
tan(ϕ)tan(\phi) = XLXCR\frac{X_{L}-X_{C}}{R}
tan(φ) =  
 X_L
/ R
- 
 X_C
/ R
tan(ϕ)tan(\phi) = XLRXCR\frac{X_{L}}{R}-\frac{X_{C}}{R}
φ = arctan(( 
 X_L
/ R
- 
 X_C
/ R
)
)
ϕ\phi = arctan((XLRXCR))arctan((\frac{X_{L}}{R}-\frac{X_{C}}{R}))
φ = arctan( 
 X_L
/ R
- 
 X_C
/ R
)
ϕ\phi = arctan(XLRXCR)arctan(\frac{X_{L}}{R}-\frac{X_{C}}{R})