Positive definite Hermitian form with same imaginary part

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Consider a complex vector space V,

if I decompose a Postive definite Hermitian form (,) into real and imaginary part, i get $$(v,w)=\lbrace v,w \rbrace +[v,w]i$$ How can I show that whenever two such herimitian form have equal imaginary part, the two forms are equal?
Thanks in advance.

My thoughts: I try to make use of a n dimension complex vector space has the same basis as n dimension real vector space has...