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  1. I

    [MOVED] Suppose cos(x +y) = 1/4 and cos x cos y = 5/24,

    Try using the identity, cos(x+y)=cos(x)cos(y)-sin(x)sin(y), substitute it into the first equation
  2. I

    [MOVED] Suppose cos(x+y) = 1/4 and cos x cos y = 5/24.

    Try using the identity, cos(x+y)=cos(x)cos(y)-sin(x)sin(y) into the first equation
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