$[\nu_4,\iota_4]=?$, where $\nu_4$ is the Hopf map in $\pi_7(S^4)$ and $\iota_4$ is the generator of $\pi_4(S^4)$ which represent the identity map, $[-,-]$ is whitehead product.
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notation corrected
$[\nu_4,\iota_4]=?$, $\nu_4$ is the Hopf map in $\pi_7(S^4)$ and $\iota_4$ is the generator of $\pi_4(S^4)$
user21719
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