ПОЖАЛУЙСТА ПОМОГИТЕ ООЧЕННЬЬ НУЖНО
a) 2tg * (3pi)/4 * ctg * (3pi)/4
b) sin^2 (30 ^ 0) + cos^2 (30 ^ 0) + sin (3pi)/2 * cos pi/6
d)sin 270° + 2cos 90° + 3sin 180°​
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