JEE MAIN - Mathematics Hindi (2020 - 9th January Morning Slot - No. 16)
मान का
$${\cos ^3}\left( {{\pi \over 8}} \right)$$$${\cos}\left( {{3\pi \over 8}} \right)$$+$${\sin ^3}\left( {{\pi \over 8}} \right)$$$${\sin}\left( {{3\pi \over 8}} \right)$$
है :
$${\cos ^3}\left( {{\pi \over 8}} \right)$$$${\cos}\left( {{3\pi \over 8}} \right)$$+$${\sin ^3}\left( {{\pi \over 8}} \right)$$$${\sin}\left( {{3\pi \over 8}} \right)$$
है :
$${1 \over {\sqrt 2 }}$$
$${1 \over 2}$$
$${1 \over 4}$$
$${1 \over 2{\sqrt 2 }}$$
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