Katy works as a court reporter. She can type 27,000 words in two hours. Which of the following best represents Katy's rate in wo
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cos(3x) = cos(2x+x)
= cos(2x) cos (x) -sin(2x)sin(x)
cos(3x) = cos(2x+x)
= cos(2x) cos (x) -sin(2x)sin(x)