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Q23 ans bwside

@abcd
Max value of$4sin^2y$ is 4
Min value of$tan^4x+cot^4x$ is 2So equality holds when
$sin^2y=1$
and$tan^4x+cot^4x=2$ or$tan^4x=1$
Q23 ans bwside
@abcd
Max value of
Min value of
So equality holds when
and