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marusya05 [52]
3 years ago
10

Find 4cos2a, if

d="TexFormula1" title=" \cos(a) = \frac{ \sqrt{3} }{2} " alt=" \cos(a) = \frac{ \sqrt{3} }{2} " align="absmiddle" class="latex-formula">
​
Mathematics
1 answer:
aniked [119]3 years ago
5 0

If you mean to find 4 cos(2<em>a</em>), then recall the double angle identity for cosine:

cos(2<em>x</em>) = 2 cos²(<em>x</em>) - 1

so that

4 cos(2<em>a</em>) = 4 (2 cos²(<em>x</em>) - 1) = 4 (√3 - 1)

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