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Step-by-step explanation:
put ¢ = π/4
cotπ/4 = tan π/4 = 1
cot3π/4 = tan 3π/4 = -1
now ,. ___1____. + ___1____
1 -. (-1). 1. - (-1)
___1____. + ___1____
1 +1 1 +1
_1_. + _1_
2 2
= 1 ans
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