Вычислить :
1) 2sin^2 (-5п/3)
2) cos^3 (п/4)
3) 5 sin^2 (-п/4) + cos^2 (-3п/4)
4) 6cos^2 (-5п/6)•sin^2 3п
5) sin^3 (-2п/3) + cos^2 (-7п)

не относитесь к работе халатно.
если есть возможность, то решение распишите более подробно.

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Sin 2000 = sin (1800+200) = sin (360*5+180+20) = sin (180+20) = -sin 20
sin (-1000) = sin (1080-1000) = sin (360*3-1000) = sin 80 = sin (90-10) = cos 10
cos 1509 = cos (1440+69) = cos(360*4+69) = cos 69 = cos (90-21) = sin 21
cos (-2900) = cos (2880-2900) = cos (360*8-2900) = cos (-20) = cos 20
tg 606 = tg (540+66) = tg (180*3+66) = tg 66 = tg (90-24) = ctg 24
tg (-400) = tg (360-400) = tg (-40) = -tg 40
ctg 1315 = ctg (1260+55) = ctg (7*180+55) = ctg 55 = ctg (90-35) = tg 35
ctg (-320) = ctg (360-320) = ctg 40
sin (-7,3pi) = -sin (7,3pi) = -sin (7pi+0,3pi) = sin (0,3pi)
cos (34pi/9) = cos (36pi/9-2pi/9) = cos (4pi-2pi/9) = cos (-2pi/9) = cos (2pi/9)
tg (-17pi/18) = tg (pi-17pi/18) = tg (pi/18)
ctg (-41pi/45) = ctg (pi-41pi/45) = ctg (4pi/45)

Sin 2000 = sin (1800+200) = sin (360*5+180+20) = sin (180+20) = -sin 20
sin (-1000) = sin (1080-1000) = sin (360*3-1000) = sin 80 = sin (90-10) = cos 10
cos 1509 = cos (1440+69) = cos(360*4+69) = cos 69 = cos (90-21) = sin 21
cos (-2900) = cos (2880-2900) = cos (360*8-2900) = cos (-20) = cos 20
tg 606 = tg (540+66) = tg (180*3+66) = tg 66 = tg (90-24) = ctg 24
tg (-400) = tg (360-400) = tg (-40) = -tg 40
ctg 1315 = ctg (1260+55) = ctg (7*180+55) = ctg 55 = ctg (90-35) = tg 35
ctg (-320) = ctg (360-320) = ctg 40
sin (-7,3pi) = -sin (7,3pi) = -sin (7pi+0,3pi) = sin (0,3pi)
cos (34pi/9) = cos (36pi/9-2pi/9) = cos (4pi-2pi/9) = cos (-2pi/9) = cos (2pi/9)
tg (-17pi/18) = tg (pi-17pi/18) = tg (pi/18)
ctg (-41pi/45) = ctg (pi-41pi/45) = ctg (4pi/45)