Question

sin(2a)=2sin^2 a-1 for all values of a true or false

Answer 1

its Cos(2a), yeah its true for all... and the formula is -
Cos(2a)=2Cos^2(a)-1=1-2Sin^2(a)

Answer 2

@kr7210 It says sin(2a) not cos(2a)?

Answer 3

Sin(2a) = 2Sin(a)Cos(a)

Answer 4

Yes, but you can't change that into 2Cos^2(a)-1 because none of the terms are squared.

Answer 5

didn't get u, i juss wrote a right formula.. search on google buddy

Answer 6

Alright...

Answer 7

and please let me know if i did wrong @Calcmathlete ;)

Answer 8

No. The second time you did it right. It's just that the answer to the original question is false. :)

Answer 9

:)