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    • Thread Starter

    Hello there,

    Could someone please check my answer to the following question:-

    Express 4sinx + 3cosx in the form Rsin(x+alpha), where R and alpha are constants with R>0 and 0<alpha<90.

    I got alpha = 36.87?? (2DP)

    I got R = +/- 5??

    therefore 5sin(x+36.87)??

    Hence find the greatest value of:-

    1/(4sinx + 3cosx + 7).

    I got:

    -5 </= 5sin(x+36.87) </= +5

    therefore the greatest value = 1/2??

    Any help would be appreciated! Thanks!


    Unlucky with Bristol. They rejected me as well
    • Thread Starter

    (Original post by chaz1992)

    Unlucky with Bristol. They rejected me as well
    Thanks for your time. I'm sorry bout Bristol too.
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