Math, asked by kurmila3, 1 year ago

if a=30 degree find cos 2a

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Answers

Answered by kranjna555oxa8gk

Cos 2(30) =cos 60 = 1/2

Answered by Shivam901

Cos2a=Cos^2a-Sin^2a
Cos2(30)=Cos^2(30)-Sin^2(30)
Now u can do the further processes

wantedgirl: It's wrong dude

wantedgirl: sorry it's right

wantedgirl: but you can also solve it further

kranjna555oxa8gk: Bt how its wrong??

Shivam901: Its correct

Shivam901: i dont have...enough time tk do that

kranjna555oxa8gk: I can tell that

Shivam901: Yes...

Shivam901: by putting value of cos30 and sin30 u will get answer

kranjna555oxa8gk: Yaa u re right

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