JEE MAIN - Mathematics Hindi (2021 - 1st September Evening Shift - No. 12)
फ़ंक्शन की परास $$f(x) = {\log _{\sqrt 5 }}\left( {3 + \cos \left( {{{3\pi } \over 4} + x} \right) + \cos \left( {{\pi \over 4} + x} \right) + \cos \left( {{\pi \over 4} - x} \right) - \cos \left( {{{3\pi } \over 4} - x} \right)} \right)$$ है :
$$\left( {0,\sqrt 5 } \right)$$
[$$-$$2, 2]
$$\left[ {{1 \over {\sqrt 5 }},\sqrt 5 } \right]$$
[0, 2]
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