помогите упростить выражение:
tg ( x - [tex]\frac{ \pi }{4} [/tex] ) - tg ( x + [tex]\frac{ \pi }{4} [/tex] )
=sin(x-п/4-x-п/4)/cos(x-п/4)cos(x+п/4)=-sin(п/2)/cos(x-п/4)cos(x+п/4)=-1/0,5*(cos2x)=-2/cos2x
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=sin(x-п/4-x-п/4)/cos(x-п/4)cos(x+п/4)=-sin(п/2)/cos(x-п/4)cos(x+п/4)=-1/0,5*(cos2x)=-2/cos2x