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Demonstrați:
a) 4cosx • cos(pi+x) • cos(pi-x) = cos3x;

b) cos³x • sin3x + sin³x • cos3x = ¾ sin4x ;

c) cos2x - 3cosx + 4 = (cos3x + 9) / (2cosx +3)

Demonstrați a 4cosx cospix cospix cos3x b cosx sin3x sinx cos3x sin4x c cos2x 3cosx 4 cos3x 9 2cosx 3 class=

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