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5. a) By using identity cos(4+B)=cos Acos B-sin Asin B, prove that 4sec' 0 3-tan' 0 sed@ + 30)sec(0- 30)= b) Using the result
5. a) By using identity cos(4+B)=cos Acos B-sin Asin B, prove that 4sec' 0 3-tan' 0 sed@ + 30)sec(0- 30)= b) Using the result in (a), solve sed@+ 30 )sed0-30)=-tan' 0 for - 180 sos 180.
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An Introduction to Analysis
Authors: William R. Wade
4th edition
132296381, 978-0132296380
