Asked by Kristien
Sin4A - cos4A = sin2A - cos2A
Can i just square root the left side??:O
Can i just square root the left side??:O
Answers
Answered by
bobpursley
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.
let A=90 deg
sin(360)-cos(360)=0-1
sin(180)-cos(180)=0+1
The sides are not equal.
Answered by
Kristien
?? Im sorry i don't understand what u did but im sure that this is an identity we have to prove that the left side equals the right side:)
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