Dat destroyer math problem help

[spoog74]

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in the dat destroyer, the math section problem 2 how did they conclude that sin 44= 2sin22cos22? Can someone please explain that? I know that sin 0 = 1 / csc 0 but where do i go from there? Someone help thank you !

 

[qkchen]

it's a trig identity, where sin(2x) = 2sin(x)cos(x)

in the dat destroyer, the math section problem 2 how did they conclude that sin 44= 2sin22cos22? Can someone please explain that? I know that sin 0 = 1 / csc 0 but where do i go from there? Someone help thank you !

 

[wizi]

1st: remember
Sin(ab) = 2sina*cosb

2nd: 44 = 2*22 --> a = 22 and b = 22

3rd: apply the 1st formula

sin44 = 2sin22*cos22

 

[spoog74]

the problem with this question for me is that i wasnt aware we had to know of that specific identity... Neither the kaplan nor the other dat practice reviews include it in the reviews.....