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express cos4 ​​ A in terms of cosA

express cos4​​A in terms of cosA

Grade:11

1 Answers

ng29
1698 Points
6 years ago
it is just application of trigonometry formula 
split 4A in A+3A and use formula for cos(a+b)
then expand formula for cos3x, u will get ur desired form of answer
 
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