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sin(90-2x)-sin2x=√2/2 na iloczyn
2sin(45-2x)cos(45)=√2/2
sin(45-2x)=1/2⇒
45-2x=30+k360 ∨ 45-2x=150+k360
2x=15-k360 ∨ 2x=-105-k360
x=7,5-k·180 ∧k∈C
∨
x=-52,5-k·180 ∧k∈C