Question

Тригонометрия 10 класс
4cos^3x-корень3cos2x=sin2x+2


И
Cosp/17cos2p/17cos3p/17cos4p/17

Answer 1

1.
$4cos^{2}(x)- sqrt{3cos(2x)} =sin(2x)+2$
$4cos^{2}(x)- sqrt{3} sqrt{cos(2x)}=sin(2x)+2$
$4cos^{3}(x)=sin(2x)+ sqrt{3} sqrt{cos(2x)}+2$
$cos^{3}(x)+cos(3x)- sqrt{3} sqrt{cos(2x)}=sin(2x)+2$
$cos^{3}(x)+3(cos(3x)- sqrt{3} sqrt{cos(2x)}-3sin^{2}(x)cos(x)$$=2sin(x)cos(x)+2$
2.
$frac{cos( pi )}{17}( frac{1}{17}cos(2 pi))( frac{1}{17}cos(3 pi ))( frac{1}{17} cos(4 pi )= frac{1}{83521}$