Найти значение выражения 20/cos^2(33)+3+cos^2(123)
сos33=cos(90-57)=sin57
cos123=cos(180-57)= -cos57
20 20 20 20
--------------------------= ------------------------- =-------------=--------=5
cos²33+3+cos²123 sin²57+3+cos²57 3+1 4
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сos33=cos(90-57)=sin57
cos123=cos(180-57)= -cos57
20 20 20 20
--------------------------= ------------------------- =-------------=--------=5
cos²33+3+cos²123 sin²57+3+cos²57 3+1 4