Пожалуйстаааааа, помогитеее Докажите тождество:
а)1/2(m+n)^2+1/2(m-n)=m^2+n^2
б)(1/2(m+n))^2-(1/2(m-n))^2=mn
в)(7b-5c)^2(d+2c)-d((7b+2c)^2-119c^2)=50c^3
г)(3a-2x)^2(a+3x)-((a-x)(a^2+16ax-16x^2)-4x^3)=8a^3
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