2⁢π⁢sin⁡θ⁢w⁡(cos⁡θ)=|(ⅇ2⁢ⅈ⁢θ;q)∞(a⁢ⅇⅈ⁢θ,b⁢ⅇⅈ⁢θ,c⁢ⅇⅈ⁢θ,d⁢ⅇⅈ⁢θ;q)∞|2,