1)sin (a-π/2); 2)cos (a-π/2)
3)sin (a-π)
4)cos (a-π)
5)tg (a-3π/2)
6)ctg (a-π/2)

1)sina a=12/13 и а€(π/2;π) sin(3π/2+a)
2)sin a=-7/9 и a€(π;3π/2) cos(π+a)
3)cos a=-4/5 и а€(π/2;π) и tg(2π-a).
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найлешка    1   12.02.2021 11:58    0