[ выпуск 2004 ]
[ поболтаем? ]
[ шпоры и ответы ]
Основные формулы по тригонометрии.
cos(x-y)=cosx*cosy+sinx*siny cos(x+y)=cosx*cosy-sinx*siny sin(x-y)=sinx*cosy-cosx*siny sin(x+y)=sinx*cosy+cosx*siny sin2x=2sinx*cosx cos2x=cos2x-sin2x=1-2sin2x=2cos2x-1 sin3x=3sinx-4sin3x cos3x=4cos3x-3cosx cosx*cosy=1/2[cos(x+y)+cos(x-y)] sinx*siny=1/2[cos(x-y)-cos(x+y)] sinx*cosy=1/2[sin(x+y)+sin(x-y)] sinx=a; a=(-1)^k*arcsinx+Pk x=arcsinx+2Pn x=P-arcsinx+2Pn sinx=1, t=P/2+2Pn sinx=0, x=Pn sinx=-1, x= -P/2+2Pn cosx=a, x=+-arccosa+2Pn cosx=1, x=2Pn cosx=0, x=P/2+Pn cosx= -1, x=P+2Pn tgx=a, x=arctga+Pn tgx=1, x=P/4+Pn tgx=0, x=Pn tgx=-1, x=-P/4+Pn |
