Упростить : 1) sin9a/sin3a-cos9a/cos3a - 2
sin9a/sin3a-cos9a/cos3a - 2=(sin9acos3a-cos9asin3a)/sin3acos3a-2=
=(sin6a-sin6a)/sin3acos3a=0
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sin9a/sin3a-cos9a/cos3a - 2=(sin9acos3a-cos9asin3a)/sin3acos3a-2=
=(sin6a-sin6a)/sin3acos3a=0