Prosze o dop , ale powinno wyjsc √2/2:
x^2=(1-x)(1+x)
x^2=1-x^2
x^2+x^2=1
2x^2=1
x^2=1/2
x=√(1/2)=1/√2=√2/√2*√2=√2/2
x=√2/2
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x^2=(1-x)(1+x)
x^2=1-x^2
x^2+x^2=1
2x^2=1
x^2=1/2
x=√(1/2)=1/√2=√2/√2*√2=√2/2
x=√2/2