Math, asked by ksarun7725, 8 months ago

Prove cot2A=Cot'2A-1/2COTA

Answers

Answered by sandy1816
8

Step-by-step explanation:

we know

cot(A+B)=cotAcotB-1/cotB+cotA

replace B by A

cot(A+A)=cotAcotA-1/cotA+cotA

cot2A=cot²A-1/2cotA

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