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Use a double-angle formula to rewrite the expression.14 cos2 x − 7

Use A Doubleangle Formula To Rewrite The Expression14 Cos2 X 7 class=

Sagot :

we have the expression

[tex]\begin{gathered} 14cos^2x-7 \\ 7(2cos^2x-1) \end{gathered}[/tex]

Remember that

[tex]cos(2x)=2cos^2x-1[/tex]

substitute in the given expression

[tex]\begin{gathered} 7(2cos^{2}x-1) \\ 7(cos(2x)) \\ 7cos(2x) \end{gathered}[/tex]

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