1) tg135 *cos(-300)=tg(90+45) * cos300= -ctg45 * cos(360-60)= -1 *cos60= -1/2
2) 8 *tg7π/3 * tg11π/6= 8 * tg(2π+π/3) * tg(2π-π/6)=8*tgπ/3 * (-tgπ/6)= -8*√3 * √3/3= -8
3) 8 tg150* sin(-300) * cos720= 8 tg(180-30) *(-sin(360-60)) * cos(2*360)=
=8* (-tg30) * sin60 *1=-8 * √3/3 *√3/2= -4
tg135=-1
cos(-300)=0.5
1)-1*0.5=-0.5
8tg7n/3=1.02914
tg11n/6=0.10086
2)1.02914*0.10086=0.1038
8tg150=-4.6188
sin(-300)=0.86603
cos720=1
3)-4.6188*0.86603*1=0.08989
1) tg135 *cos(-300)=tg(90+45) * cos300= -ctg45 * cos(360-60)= -1 *cos60= -1/2
2) 8 *tg7π/3 * tg11π/6= 8 * tg(2π+π/3) * tg(2π-π/6)=8*tgπ/3 * (-tgπ/6)= -8*√3 * √3/3= -8
3) 8 tg150* sin(-300) * cos720= 8 tg(180-30) *(-sin(360-60)) * cos(2*360)=
=8* (-tg30) * sin60 *1=-8 * √3/3 *√3/2= -4
tg135=-1
cos(-300)=0.5
1)-1*0.5=-0.5
8tg7n/3=1.02914
tg11n/6=0.10086
2)1.02914*0.10086=0.1038
8tg150=-4.6188
sin(-300)=0.86603
cos720=1
3)-4.6188*0.86603*1=0.08989