Let \( \int \frac{\cos x}{\sin ^{3} x\left(1+\sin ^{6} x\right)^{2 / 3}} d x=f(x)\left(1+\sin ^{....
Let \( \int \frac{\cos x}{\sin ^{3} x\left(1+\sin ^{6} x\right)^{2 / 3}} d x=f(x)\left(1+\sin ^{6} x\right)^{1 / \lambda}+C \)
\( \mathrm{P} \)
Then \( \lambda f\left(\frac{\pi}{3}\right)= \)
(1) 4
(2) -2
(3) 8
(4) -4
.
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