express cos4A in terms of cosA
express cos4A in terms of cosA
Souvik Samanta , 10 Years ago
Grade 11
Trigonometry> express cos4 A in terms of cosA...
1 Answers
ng29
Last Activity: 10 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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