Trig identities:(

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Sin4A - cos4A = sin2A - cos2A

Can i just square root the left side??:O

  • Trig identities:( -

    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.

  • Trig identities:( -

    ?? 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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