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Grade: 11 

                        
express cos4 ​​ A in terms of cosA
5 years ago

Answers : (1)

ng29
1698 Points 
							
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
 
APPROVE IF USEFUL
5 years ago
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