2)=2√3sin(360+240)=2√3sin240=2√3sin(270-30)=-2√3cos30=-2√3*√3/2=-3
3)=-4√2cos(π-π/4)=4√2cosπ/4=4√2*1/√2=4
4)=5cos(180-10)/cos10=-5cos10/cos10=-5
5)=(2sinπ/9-5sin(π-π/9))/(2cos(2π-7π/18)-3cos7π/18))=
=(2sinπ/9-5sinπ/9)/(2cos7π/18-3cos7π/18)=(-3sinπ/9)/(-cos7π/18)=
=(3sinπ/9)/(cos(π/2-π/9))=(3sinπ/9)/(sinπ/9)=3
9)=-tga+2tga+tga=2tga
tga=0,5 2*0,5=1
14)=-3tga+3tga-tga=-tga
tga=0,05 -0,05
15)=2cosa-2cosa=-4cosa
cosa=0,45 -4*0,45=-1,8