Math, asked by venusdemor3709, 1 year ago

Cos60= cos square 30 minus sin square 30 = 1 by 2

Answers

Answered by Nishita12345
1

Here is your answer....

cos 60° = cos^2 30° - sin^2 30° = 1/2

[ we know that cos 60° = 1/2 ,

cos 30° = root 3/2 , sin 30° = 1/2]

then from question.....

1/2 = (root 3 /2)^2 - (1/2)^2 = 1/2

1/2 = 3/4 - 1/4 = 1/2

1/2 = 2/4 = 1/2

1/2 = 1/2 = 1/2

hence proved..

hope this will help you .....

if it is helpful then plzz mark it as brainliest....

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