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Edexcel C3 Trig identities question Watch

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    Q 8a

    http://qualifications.pearson.com/co...c_20150812.pdf

    I can get to cos^2A + sin^2A + 2sinAcosA line (3 from bottom)

    However how do they magically jump from this to the next line??
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    (Original post by ShivP_98)
    Q 8a

    http://qualifications.pearson.com/co...c_20150812.pdf

    I can get to cos^2A + sin^2A + 2sinAcosA line (3 from bottom)

    However how do they magically jump from this to the next line??
    This is basically a^2+b^2+2ab = (a+b)^2=(a+b)(a+b)

    And denominator is the difference of two squares.
 
 
 
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