Math, asked by Studyowl1, 1 year ago

Prove that cos2A = (1 - tan²A)/2tanA

Answers

Answered by mysticd

may be the lhs is cot 2A
plz check

Attachments:

Studyowl1: 2cosAsinA = sin2A - How?

Studyowl1: (cos²A - sin²A)/2cosAsinA - How?

mysticd: sin2A= sin(A+A)

mysticd: =sinAcosA+cosAsinA

mysticd: =2sinAcosA

mysticd: Therefore sin2A= 2sinAcosA

mysticd: is it clear

Studyowl1: oh, i got it! Thank u very much! u guys r brilliant! :)

mysticd: :)

mysticd: thank u selecting as brainliest

Answered by Anonymous

Step-by-step explanation:

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