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Pre-calculus/trig

 Apr 1, 2019
 #1
avatar+18274 
+2

cos(2x) = cos^2(x) - sin^2(x) = 2 cos^2(x) - 1 = 1 - 2 sin^2(x)        No math guniousity used...I just looked it up.   cheeky

 Apr 1, 2019
 #2
avatar+315 
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So, is it the first and third option?

Cupcake  Apr 1, 2019
 #3
avatar+18274 
+1

Yes....of the 4 options it is the 1st and 3rd.

ElectricPavlov  Apr 1, 2019

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