December 2018 1 7 Report
Oblicz sin(α+β) i cos(α+β), jeśli:
a) sinα= √2/2 , cosβ=1/2 i α∈(π/2;π) , β∈(0;π/2)
b) sinα=-√3/2 , cosβ=√2/2 i α,β∈(3π/2;2π)
c) sinα=1/3 , cosβ=2√2/3 i α∈(π/2;π), β(3π/2: 2π)
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