If $\int \frac{\cos x d x}{\sin ^3 x\left(1+\sin ^6 x\right)^{2 / 3}}=f(x)\left(1+\sin ^6 x\right)^{1 / 2}+c$ where $c$ is a constant of integration, then $\lambda f\left(\frac{\pi}{3}\right)$ is equal to
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