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Invalid expression. When calling...

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Liam Sullivan
Liam Sullivan 2020-1-9
评论： Liam Sullivan 2020-1-15
I have a code that says
Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.
when i am trying to type cos^2(x/2). Also, i have defined x as pi/6.

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Walter Roberson
Walter Roberson 2020-1-9
cos(x/2)^2

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