Math, asked by VijayaLaxmiMehra1, 1 year ago

Let A = 30°, Verify that

sin2A = (2tanA) / ( 1 + tan^2A) ;

cos2A = ( 1 - tan^2A ) / ( 1 + tan^A ).​

Answers

Answered by jasmeenk277gmailcom
1

ist answer mar ke brainlist

Attachments:
Answered by Anonymous
4

Answer:

Given

A = 30°

Sin²A = ( 2 tan A ) / ( 1 + tan²2A )

2 . tan 30° / 1 + tan²30°

2 . 1/√3 / 1 + (1/√3)²

2/√3 / 1 + (1/3 )

2/√3 / 3+1/3

2/√3 / 4/3

2/√3 × 3/4

3 / 23

Cos²A = ( 1 - tan²A ) / ( 1 + tan A )

1 - tan²30° / 1 + tan 30°

1 - (1/√3)² / 1 + 1/√3

1 - 1/3 / 1 + 1/√3

3 - 1 / 3 / 1 / √3

2/3 / 1/√3

2/3 × √3/1

23 / 3

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