пожалуйста помогите срочно нужно это вопрос жизни и смерти
(cos 20п/3 - sin 17п/6)*sin(-27,5п):cos(-31п/4)
(cos 20п/3 - sin 17п/6)*sin(-27,5п):cos(-31п/4)
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Answers & Comments
cos(20pi/3)=cos(6pi+2pi/3)=cos(2pi/3)=-0.5
sin(17pi/6)=sin(2pi+5pi/6)=sin(5pi/6)=0.5
sin(-27.5pi)=sin(-28pi+pi/2)=sin(pi/2)=1
cos(-31pi/4)=cos(-8pi+pi/4)=cos(pi/4)=√2/2
(-0.5-0.5)*1:(√2/2)=-1/(√2/2)=-√2