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C3 Trigonometry help Watch

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    I'm stuck on this part of the question and i'm not sure where i can go from here, would be great if someone could explain this?

    https://postimg.org/image/tnxem6j1j/


    Thanks


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    (Original post by bhfn)
    I'm stuck on this part of the question and i'm not sure where i can go from here, would be great if someone could explain this?

    https://postimg.org/image/tnxem6j1j/


    Thanks


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    the top can be written as the difference of 2 squares...*
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    I'm assuming that this is an identity that you are trying to prove. Your first step is good - you can now see that the numerator is the difference of two squares. Now - how do you factorise the difference of two squares?
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    (Original post by Pangol)
    I'm assuming that this is an identity that you are trying to prove. Your first step is good - you can now see that the numerator is the difference of two squares. Now - how do you factorise the difference of two squares?
    so it would be
    (cos^2 x + sin^2 x)(cos^2 x - sin^2 x) and then cancel out with the denominator and it would equal 1?


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    I would say so!
 
 
 
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