cot (45°+A)-cot (45°-A) = ?
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Step-by-step explanation:
cot(45+A)=
cot(45-A)=
1-tan45.tanA
1
tan(45+ A) tan45+ tanA
1 1+tan45-tanA
tan(45 - A) tan45 - tanA
cot(45+A)-cot(45- A)=1.
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