The value of 3+cotâ¡76âcotâ¡16âcotâ¡76â+cotâ¡16â is
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a
cot 44°
b
cot 46°
c
tan 2â
d
cot 92â
answer is A.
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Detailed Solution
We can write 4+cotâ¡76âcotâ¡16ââ1cotâ¡76â+cotâ¡16â=4sinâ¡76âsinâ¡16âsinâ¡92â+cotâ¡92â=2cosâ¡60ââcosâ¡92â+cosâ¡92âsinâ¡92â=1âcosâ¡92âsinâ¡92â=cotâ¡46â=tanâ¡44â