. Expanding yields
![\bf cos[4x]\iff cos[2(2x)]\implies 2cos^2[2x]-1\iff 2[cos(2x)]^2-1 \\\\\\ 2[\ 2cos^2(x)-1\ ]^2-1\impliedby \textit{now, expanding the binomial} \\\\\\ 2[\ 2^2cos^4(x)-4cos^2(x)+1^2\ ]-1 \\\\\\ 2[\ 4cos^4(x)-4cos^2(x)+1\ ]-1 \\\\\\\ [\ 8cos^4(x)-8cos^2(x)+2\ ]-1 \\\\\\ 8cos^4(x)-8cos^2(x)+2-1\implies 8cos^4(x)-8cos^2(x)+1](/tpl/images/0306/9541/846f4.png)
Pre-calculus !
rewrite cos4x in terms of cosx
!...
Mathematics, 10.10.2019 13:20 maddieberridgeowud2s
Pre-calculus !
rewrite cos4x in terms of cosx
!
Answers: 1
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