Math
Math, 18.10.2019 06:00, mahitej

(i) cosx + sinx = _/2 cosx
find cosx - sinx

(ii) 3cosx + 4cosy - 7cosz = -14.
find 4sin x/2 + 5sin y/2 + 2 sin z/2 ?
if (x, y,z) belongs to (

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