Вычислите а) arcs in (-1:2) б) cos

a) arcsin (-1) / 2)=-0,523598776arccos (-1)=3,14159265) б) cos (arcsin (-1/2) -arcsin 1) arcsin (-1/2)=-π/6arcsin 1=π/2cos (arcsin (-1/2) -arcsin 1)=cos (-π/6-π/2)=cos (-4π/6)=cos (2π/3)=-1/2 в) sin (17 pi/3) cos (5pi/4)=1/2{2sin (17pi/3) cos (5pi/4) }=1/2{2 sin (6pi — pi/3) cos (pi+pi/4)=1/2{ -2sin (pi/3) (- cos (pi/4) }=1/2{2sin (pi/3) cos (pi/4) }=1/2{ sin (pi/3+pi4)+sin (pi/3- pi/4) }=1/2{ sin (7pi/12)+sin (pi/12}}=1/2{ sin (105)+sin (15) }=1/2{sin (90+15)+sin (15) }=1/2{ cos (15)+sin (15) }=1/2{cos (45-30)+sin (45-30) }=1/2[{cos (45) cos (30)+sin (45) sin (30) }+{sin (45) cos (30) — cos (45) sin (30) }]=1/2{2 (1/sqrt (2) (sqrt (3) /2)=1/2{sqrt (3/2) } г)