Ответы на вопрос:
√50cos²(9π/8)-√50sin²(9π/8)=√50(cos²(9π/8)-sin²(9π/8))= =√50cos(2*9π/8)=√50cos(9π/4)=√50cos(2π+π/4)= =√50cos(π/4)=√50*√2/2=√100 /2=10/2=5
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