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23 September, 17:00

3cosx+4sinx=2 solve for angle between 0 and 360 (0

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  1. 23 September, 17:11
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    Let 4sinx + 3cosx = R sin (x + a) = Rsinxcosa + Rcosxsina

    equating coefficients of sinx and cosx:-

    RcosA = 4 ... (1)

    RsinA = 3 ... (2)

    So

    tan A = 3/4 and A = 36.87 degrees

    Find R by squaring and adding (1) and (2)

    25 = R^2

    R = 5

    so we have 5sin (x + 36.87) = 2

    sin (x + 36.87) = 0.4

    x + 36.87 = arcsin 0.4 = 23.58 degrees

    x = - 13.29 degrees

    answer is 346.7 degrees
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