Question

1-2cos^2(п/4-п/3)
упростить......

Answer 1

-1cos^п/2...................

Answer 2

$=-cos2( frac{ pi }{4} - frac{ pi }{3} )=-cos2*(- frac{ pi }{12}) =-cos (- frac{ pi }{6} )=-cos frac{ pi }{6} =- frac{ sqrt{3} }{2}$