Posted by Kristien on Saturday, February 23, 2013 at 7:43pm.
I don't think it is an identity.
let A=90 deg
sin(360)-cos(360)=0-1
sin(180)-cos(180)=0+1
The sides are not equal.
?? Im sorry i dont understand what u did but im sure tht this is an identity we have to prove tht the left side equals the right side:)
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