1) arctg √2 + 1/√2 - 1 - arcctg √2/2 = π/4
arctg (√2 + 1)(√2+1) - arcctg √2/2 = 0,785398
arctg (√2 + 1)² - arcctg √2/2 = 0,785398
arctg 2 + 2√2 + 1 - arcctg √2/2 = 0,785398
arctg 3 + 2√2 - arcctg √2/2 = 0,785398
0,445561 = 0,785398 - ЛОЖЬ
2) arctg 3 - arcsin √5/5 = π/4
0,785398 = 0,785398 - ИСТИНА
3) arcsin 5/13 + arcsin 12/13 = π/2
1,5708 = 1,5708 - ИСТИНА
4) π/2 + arcsin 77/85 = arcsin 8/17 + arccos(-3/5)
π/2 + arcsin 77/85 = arcsin 8/17 + π - arccos 3/5
2,70425 = 2,70425 - ИСТИНА
