Not sure what you are asking. Can you give an example?

Not sure what you are asking. Can you give an example?

law of cosines (answer)

use the law of cosines. its pretty straight forward. Usually when you learn the law of cosines you learn that c^2 = a^2 + b^2 - 2ab cos C. You use this form if you have angle C. If you have angle A, which is what your question is asking, you use: a^2 = b^2 +...

when working with parentheses, always work inside out. in this case you would evaluate -2-1 then multiply it by -1 then square it then add 4

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