J ν ′ ⁡ ( x ) ⁢ Y ν ⁡ ( λ ⁢ x ) − Y ν ′ ⁡ ( x ) ⁢ J ν ⁡ ( λ ⁢ x ) J_{\nu }'\left(x\right)Y_{\nu }\left(\lambda x\right)-Y_{\nu }'\left(x\right)J_{\nu }\left(\lambda x\right)