Ry122
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Is this correct?
(bcos30-85.7)(bcos30-85.7)=b²cos²30-85.7cos30-85.7bcos30+85.7²
(bcos30-85.7)(bcos30-85.7)=b²cos²30-85.7cos30-85.7bcos30+85.7²
Simplifying a trigonometric binomial
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Snazzy
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You're missing a b term for 85.7cos30 and then you have to simplify.
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